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The Weight of “Nothing” Could Mean Everything (to Physics)

Video vocabulary

abundant

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US / əˈbʌndənt /

UK / əˈbʌndənt /

B2
  • adjecitve
  • Being in very great supply; plentiful

dna

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US / ˌdiː en ˈeɪ /

UK / ˌdiː en ˈeɪ /

B2
  • noun
  • Chemical in living cells with genetic information

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

fudge

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US / fʌdʒ /

UK / fʌdʒ /

C1
  • noun
  • Soft sweet made from butter and milk
  • verb
  • To avoid dealing with an issue, problem

force

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US / fɔ:s /

UK / fɔrs, fors /

A1
  • noun
  • Group of persons trained for military action; army
  • Pressure; attraction
  • The use of physical strength/violence to persuade
  • verb
  • To use physical strength or violence to persuade

include

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US / ɪnˈklu:d /

UK / ɪnˈklud /

A1
  • verb
  • To make someone, something part of a group

manager

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US / ˈmænɪdʒə(r) /

UK / ˈmænɪdʒɚ /

A1
  • noun
  • Person who controls and runs a business or group

physic

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US / 'fɪzɪk /

UK / 'fɪzɪk /

A1
  • noun
  • (Archaic) medicine causing evacuation of the bowels

physicist

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US / ˈfɪzɪsɪst /

UK / ˈfɪzɪsɪst /

B2
  • noun
  • Person who studies and works in physics

must

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US / məst /

UK / mʌst /

A1
  • noun
  • Something that is necessary or required
  • other
  • (Used to state that something ought to be true)
  • Used to say something is required or necessary

quiet

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US / 'kwaɪət /

UK / ˈkwaɪɪt /

A1
  • adjecitve
  • Hidden, or done in a private way
  • Not loud; making very little sound
  • verb
  • To cause to become calmer or less loud

step

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US / step /

UK / stɛp /

A1
  • noun
  • Movement done as part of a particular dance
  • Distance covered by one movement of a leg; stride
  • One part or stage in a process
  • Sound made by the feet while walking; footstep
  • Flat horizontal piece that forms stairs
  • verb
  • To raise and moving the foot to put it down

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

cause

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US / kɔ:z /

UK / kɔz /

A2
  • noun
  • Belief, goal or organization that people support
  • Reason for
  • verb
  • To make something happen; create effect or result

colossal

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US / kəˈlɒsl /

UK / kəˈlɑ:sl /

C1
  • adjecitve
  • Being extremely large in size or amount

ball

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US / bɔ:l /

UK / bɔl /

A1
  • noun
  • Large dance where people dress formally
  • Small round object often used in a game or sport

corporation

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US / ˌkɔ:pəˈreɪʃn /

UK / ˌkɔːrpəˈreɪʃn /

A2
  • noun
  • Big company or a combination of several companies

place

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US / pleɪs /

UK / ples /

A1
  • noun
  • Particular location, area or region
  • verb
  • To put someone in a particular type of situation
  • To put something in a certain location or position

own

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US / əʊn /

UK / on /

A1
  • adjecitve
  • Belong to oneself
  • determiner
  • Yours, his, hers, etc.; not belonging to another
  • pronoun
  • (Something) belong to myself
  • verb
  • To have something as your property

understanding

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US / ˌʌndəˈstændɪŋ /

UK / ˌʌndərˈstændɪŋ /

A1
  • adjecitve
  • Being sympathetic
  • noun
  • When you get the meaning correctly; comprehension
  • Knowledge about something or someone
  • verb
  • To know the meaning of language, what someone says

action

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US / 'ækʃn /

UK / ˈækʃən /

A2
  • noun
  • Something that a person or thing does
  • verb
  • To act to do something

behave

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US / bɪˈheɪv /

UK / bɪˈhev /

A2
  • verb
  • To act correctly
  • To act in a particular way
  • To react in a particular way in a given case

distort

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US / dɪ'stɔ:t /

UK / dɪˈstɔrt /

B1
  • verb
  • To change the shape, appearance, or sound
  • To exaggerate the truth or fact, e.g. to deceive

directly

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US / dəˈrektli /

UK / dɪˈrɛktli, daɪ- /

A2
  • adverb
  • In a frank and honest way
  • Right away; immediately

disc

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US / dɪsk /

UK / dɪsk /

A2
  • noun
  • Thin or flat, round object, e.g. for storing data

first

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US / fɜ:st /

UK / fɚst /

A1
  • adjecitve
  • 1st; Coming before all others in time or place
  • noun
  • Something that has not happened before
  • Position of the winner of a competition

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

present

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US / 'preznt /

UK / ˈprɛznt /

A1
  • adjecitve
  • Being in attendance; being there; having turned up
  • noun
  • Gift
  • Verb tense indicating an action is happening now
  • Current time; now
  • verb
  • To introduce someone to others
  • To host a program on television or radio
  • To give a speech or presentation
  • To show something to someone who will examine it
  • To appear or happen
  • To give an award or prize to someone

spotlight

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US / ˈspɒtlaɪt /

UK / ˈspɑ:tlaɪt /

C1
  • noun
  • Lamp that produces a strong beam of light
  • verb
  • To highlight or put attention on something

pool

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US / pu:l /

UK / pul /

A2
  • noun
  • Amount collected, e.g. money, for some purpose
  • Small body of still water
  • Game of hitting balls on a table with long sticks
  • Small area of water for swimming bound by walls
  • verb
  • (Of a liquid) to collect into a small area
  • To make a collection of (resources, money etc.)

solidly

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US / ˈsɒlɪdli /

UK / ˈsɑ:lɪdli /

A2
  • adverb
  • So as to be solid or filled right through

second

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US / 'sekənd /

UK / ˈsɛkənd /

A1
  • adjecitve
  • 2nd; the one following first
  • noun
  • Unit of time; one sixtieth of a minute
  • Short period of time that you wait for someone
  • (Do) soon
  • verb
  • To agree to support a proposal at a meeting

bottom

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US / 'bɒtəm /

UK / ˈbɑtəm /

A2
  • adjecitve
  • Concerning the part under something, e.g. a vase
  • noun
  • The part of your body you sit on
  • Lowest position, often in a company or contest
  • Lowest part of something; part on which it rests
  • Lowest level, part or point of an object
  • The part under something, e.g. a vase
  • verb
  • To hit the lowest part of something

cell

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US / sel /

UK / sɛl /

A2
  • noun
  • Smallest unit of living things in biology
  • Group of people - often from a secret organization
  • Prisoner's room in a jail
  • Shortened form of 'cellphone'

chamber

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US / 'tʃeɪmbə(r) /

UK / ˈtʃembɚ /

B1
  • noun
  • Enclosed space that contains something
  • Large room that is used for official meetings

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

existence

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US / ɪɡ'zɪstəns /

UK / ɪɡˈzɪstəns /

A2
  • noun
  • State of being present, alive or real

each

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US / i:tʃ /

UK / itʃ /

A1
  • determiner
  • Every one of two or more things
  • pronoun
  • Per one person or thing

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

perspective

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US / pə'spektɪv /

UK / pɚˈspɛktɪv /

B1
  • noun
  • Artistic method of creating a sense of distance
  • Ability to understand what is important in life

observable

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US / əbˈzɜ:vəbl /

UK / əbˈzɚvəbəl /

B1
  • adjecitve
  • Being able to be seen, noticed, or sensed

virtual

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US / ˈvɜ:tʃuəl /

UK / ˈvɚtʃuəl /

B1
  • adjecitve
  • Existing only on the internet or on a computer
  • Existing only in a digital world
  • Almost being; nearly complete

again

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US / ə'ɡen /

UK / əˈɡɛn /

A1
  • adverb
  • One more time, once more

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

fly

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US / flaɪ /

UK / flai /

A1
  • noun
  • Common flying insect, sometimes blue in color
  • Opening with fold of cloth hiding zipper on pants
  • verb
  • To move in the wind, e.g. a flag
  • To move at a high speed
  • To travel in a plane, helicopter, balloon etc.
  • To pilot people or items by plane
  • To travel through the air using wings

govern

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US / ˈgʌvn /

UK / ˈgʌvərn /

B1
  • verb
  • To officially control land and make policies

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

static

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US / ˈstætɪk /

UK / ˈstætɪk /

B2
  • adjecitve
  • Concerning electricity that collects on a surface
  • Being unchangeable or unmovable
  • noun
  • Unwanted noise that disturbs a radio or TV signal

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

bunch

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US / bʌntʃ /

UK / bʌntʃ /

B1
  • noun
  • A group of things of the same kind
  • verb
  • To group people or things closely together
  • (Cloth) to gather/be gathered together in folds

catch

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US / kætʃ /

UK / kætʃ, kɛtʃ /

A1
  • noun
  • Amount of something that has been caught
  • Trick or something trying to deceive
  • verb
  • To stop something flying and hold it
  • To stop something and not let it go, e.g. animals
  • To get sick or get a disease from someone else
  • To find someone to do something, a task
  • To get stuck on or in something
  • To be trapped so you can’t escape
  • To be able to understand what someone is saying

nothing

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US / 'nʌθɪŋ /

UK / ˈnʌθɪŋ /

A1
  • noun
  • Item of little or no value, importance, interest
  • Number or value of zero
  • pronoun
  • Not anything, not a single thing

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

square

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US / skweə(r) /

UK / skwɛr /

A2
  • adjecitve
  • Being fair or honest
  • Multiply a number by itself e.g. 2x2 or 6x6
  • noun
  • Shape with 4 equal length sides and 4 equal angles
  • The result of multiplying Length by the width
  • Open public area in the middle of the town
  • verb
  • To make something balance or be equal
  • To multiply a number by itself, e.g. 2x2 or 6x8
  • To straighten the edge to form a four-sided shape

zeros

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US / ˈzɪərəʊz /

UK / ˈzɪroʊz /

A1
  • other
  • Numbers meaning none; 0
  • verb
  • To set a scale or other device to show 0

tell

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US / tel /

UK / tɛl /

A1
  • verb
  • To (strongly) advise a person to do something
  • To be able to guess
  • To say or communicate information to someone
  • To inform, but without speaking; indicate
  • To have a negative effect on someone
  • To order someone to do something; command
  • To recognize something based on certain signs
  • To report something to an authority
  • To explain something or teach someone something

absolutely

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US / ˈæbsəlu:tli /

UK / ˈæbsəˌlutli, ˌæbsəˈlutli /

A2
  • adverb
  • Completely; totally; very

bend

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US / bend /

UK / bɛnd /

A2
  • noun
  • When a road changes direction; turn
  • verb
  • To become curved or no longer straight
  • To move your body so that it is not straight up
  • To turn in a different direction, as a road
  • To use force to make an object not straight

disk

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US / dɪsk /

UK / dɪsk /

B1
  • noun
  • Thin or flat, round object, e.g. for storing data

expand

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US / ɪk'spænd /

UK / ɪkˈspænd /

A2
  • verb
  • To make something larger in size, number, amount

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

great

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US / ɡreɪt /

UK / ɡret /

A1
  • adjecitve
  • Very large in size
  • Very important
  • Very good; fantastic; wonderful
  • adverb
  • Very good; better than before
  • noun
  • Successful and well-admired person

energy

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US / 'enədʒɪ /

UK / ˈɛnədʒi /

A2
  • noun
  • Physical or mental strength

enough

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US / ɪˈnʌf /

UK / ɪˈnʌf /

A1
  • adjecitve
  • Sufficient to answer the need
  • adverb
  • To a satisfactory degree
  • pronoun
  • Equal to what is needed; as much as required
  • Adequate number or amount

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

mix

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US / mɪks /

UK / mɪks /

A2
  • noun
  • A combination of more than two things
  • verb
  • To combine two or more things to make one
  • To meet and get along with others, e.g. at a party

sensitive

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US / 'sensətɪv /

UK / ˈsɛnsɪtɪv /

A2
  • adjecitve
  • Taking offense easily; easily upset or hurt
  • (Private information) needing careful treatment
  • Concerning awareness of small differences
  • Able to recognize the feelings of others
  • Responsive to physical touch
  • Becoming unstable

type

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US / taɪp /

UK / taɪp /

A1
  • noun
  • Printed letters or blocks used for printing them
  • Group of things or people sharing common features
  • verb
  • To identify something belonging to a group
  • To write by touching keys on a keyboard

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

elaborate

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US / ɪ'læbəreɪt /

UK / ɪˈlæbəret /

B2
  • adjecitve
  • Made or done with great care or in a detailed way
  • verb
  • To explain something in detail
  • To be made or explained with great care/in detail

despite

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US / dɪˈspaɪt /

UK / dɪˈspaɪt /

A2
  • preposition
  • Without being affected by something; in spite of

disappear

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US / ˌdɪsəˈpɪə(r) /

UK / ˌdɪsəˈpɪr /

A1
  • verb
  • To no longer see because it's not there any more

house

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US / haʊs /

UK / haʊs /

A1
  • noun
  • Place where a specific activity or business occurs
  • Building in which a family, person lives
  • verb
  • To give someone a place to live
  • To contain or store something

equipment

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US / ɪˈkwɪpmənt /

UK / ɪˈkwɪpmənt /

A2
  • noun
  • Tools or materials used to perform a task

least

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US / li:st /

UK / list /

A1
  • adverb
  • In the smallest or lowest way
  • noun
  • Something that is of the lowest or smallest degree

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

predictable

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US / prɪˈdɪktəbl /

UK / prɪˈdɪktəbl /

B1
  • adjecitve
  • Capable of being guessed before it happens

she

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US / ʃɪ /

UK / ʃi /

A1
  • pronoun
  • Female person or animal mentioned before
  • (Refers to female person mentioned before)

either

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US / ˈaɪðə(r) /

UK / ˈiðɚ, ˈaɪðɚ /

A1
  • adjecitve
  • One of two (used when there is a choice of two)
  • adverb
  • (After negative statements) likewise, in addition
  • conjunction
  • Used as the first of two connected things
  • determiner
  • Used as the first of two connected things
  • pronoun
  • The one or the other

extreme

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US / ɪk'stri:m /

UK / ɪkˈstrim /

B1
  • adjecitve
  • Very great in degree
  • Farthest from a center
  • Very severe; very strong
  • noun
  • Effort that is thought more than is necessary

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

new

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US / nju: /

UK / nu, nju /

A1
  • adjecitve
  • Not old, recently born, built or made
  • Being or doing something for the first time
  • Not felt, seen or known previously
  • Having been recently bought or obtained

small

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US / smɔ:l /

UK / smɔl /

A1
  • adjecitve
  • Little in size; not big
  • (Of letters) not written in capital letters
  • Being insignificant or minor
  • (Of a business) with few people or things; local
  • (Of voice) being soft and quiet
  • (Of a child) being young

precisely

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US / prɪˈsaɪsli /

UK / prɪˈsaɪsli /

B1
  • adverb
  • In an exact and accurate manner
  • (Emphasizes that a statement is totally correct)

try

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US / traɪ /

UK / traɪ /

A1
  • noun
  • Act of putting the ball over the rugby goal line
  • verb
  • To make an effort, to attempt to do something
  • To examine someone or something in a court of law
  • To test to see if it is good or you like it
  • To make a person go through hardship; test
  • To examine something to see if it works

certain

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US / ˈsə:tn /

UK / ˈsɚtn /

A1
  • adjecitve
  • Definite, fixed
  • Referring to an unspecified amount or quantity
  • Being sure about something; without doubt

combine

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US / kəmˈbaɪn /

UK / kəmˈbaɪn /

A2
  • verb
  • To mix several things together to form one thing

ever

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US / 'evə(r) /

UK / ˈɛvɚ /

A1
  • adverb
  • At any time; at all times in the future

explain

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US / ɪk'spleɪn /

UK / ɪkˈsplen /

A1
  • verb
  • To make clear or easy to understand by describing

sure

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US / ʃʊə(r) /

UK / ʃʊr /

A1
  • adjecitve
  • Having no doubts about something
  • Have confidence in your own words or actions
  • Firmly established or held; being firm or stable
  • Being correct or true
  • adverb
  • What you say to agree willingly

switch

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US / swɪtʃ /

UK / swɪtʃ /

A2
  • noun
  • A change or shift from one method to another
  • Thing you move to turn electrical items on or off
  • Thin flexible piece of wood or stick
  • verb
  • To exchange or replace something for another thing

himself

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US / hɪmˈself /

UK / hɪmˈsɛlf /

A1
  • pronoun
  • The same (male) person who did the action

equivalent

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US / ɪˈkwɪvələnt /

UK / ɪˈkwɪvələnt /

B1
  • adjecitve
  • Equal to something in value, use or meaning
  • noun
  • Thing like another in quality, quantity or degree

normal

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US / 'nɔ:ml /

UK / ˈnɔrməl /

A1
  • adjecitve
  • Standard or regular way of doing something
  • Having standard mental or physical ability, health

side

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US / saɪd /

UK / saɪd /

A1
  • adjecitve
  • In addition to the central or most important thing
  • Next to, or very close to, the right or left of
  • noun
  • Position or opinion that is opposite to another
  • Right or left part of a person's body
  • Feature of someone's personality
  • Straight edge of an object
  • One of two or more groups fighting each other
  • verb
  • To decide to agree with one point, not the other

too

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US / tu: /

UK / tu /

A1
  • adverb
  • In addition, also; with emphasis
  • Say that something is more than you want

uncertainty

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US / ʌn'sɜ:tntɪ /

UK / ʌnˈsə:tn:ti /

B2
  • noun
  • Feeling of not really knowing what will happen

heisenberg

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US / heɪ /

UK / heɪ /

A1

gravity

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US / ˈgrævəti /

UK / ˈɡrævɪti /

B1
  • noun
  • (Of a situation) extreme seriousness
  • Force making things fall towards the ground

imagine

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US / ɪ'mædʒɪn /

UK / ɪˈmædʒɪn /

A1
  • verb
  • To think creatively about; form mental picture of

infancy

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US / ˈɪnfənsi /

UK / ˈɪnfənsi /

B1
  • noun
  • Time of a person's life when he or she is a baby
  • Beginning stage of something

innate

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US / ɪˈneɪt /

UK / ɪˈneɪt /

B2
  • adjecitve
  • Being part of something's nature
  • Present (in a person) from birth

interact

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US / ˌɪntər'ækt /

UK / ˌɪntɚˈækt /

A2
  • verb
  • To talk or do things with each other

inside

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US / ˌɪn'saɪd /

UK / ɪnˈsaɪd, ˈɪnˌsaɪd /

A2
  • adjecitve
  • Being in something
  • Being in a building
  • adverb
  • Into a house; indoors
  • noun
  • Inner part or surface of something

matter

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US / 'mætə(r) /

UK / ˈmætɚ /

A1
  • noun
  • Material all things are made of that fills space
  • Problem or reason for concern
  • verb
  • To be of great importance; to count

publish

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US / 'pʌblɪʃ /

UK / ˈpʌblɪʃ /

A2
  • verb
  • To prepare and make available a book magazine etc.
  • To release information to the general public

once

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US / wʌns /

UK / wʌns /

A1
  • adverb
  • One time; one instance
  • At a time in the past
  • conjunction
  • When; as soon as

traffic

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US / 'træfɪk /

UK / ˈtræfɪk /

A2
  • noun
  • The cars or vehicles on the road
  • Amount of activity over a communication system

while

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US / waɪl /

UK / hwaɪl, waɪl /

A1
  • conjunction
  • In spite of the fact that; although
  • During the time that; at the same time
  • noun
  • Short amount of time

age

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US / eɪdʒ /

UK / edʒ /

A1
  • verb
  • To keep food, wine for a long time to improve it
  • To get older
  • noun
  • Period of time in history
  • Number of years a person or thing has lived

continue

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US / kən'tɪnju: /

UK / kənˈtɪnju /

A1
  • verb
  • To do something without stopping, or after pausing
  • To start doing again after a break, pause, or stop

baffle

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US / 'bæfl /

UK / ˈbæfəl /

B2
  • verb
  • To puzzle; to confuse

balance

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US / ˈbæləns /

UK / ˈbæləns /

A2
  • noun
  • Instrument for weighing things
  • Being stable; having equal weight on both sides
  • Money remaining after paying costs
  • verb
  • To be steady by having equal weight on both sides
  • To make two or more things equal

balanced

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US / ˈbælənst /

UK / ˈbælənst /

A2
  • adjecitve
  • Being stable having equal weight on both sides
  • verb
  • To be steady by having equal weight on both sides
  • To make two or more things equal

exactly

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US / ɪgˈzæktli /

UK / ɪɡˈzæktli /

A1
  • adverb
  • No more and no less than; precisely

compute

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US / kəm'pju:t /

UK / kəmˈpjut /

A1
  • verb
  • To find out by calculating or estimating

peak

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US / pi:k /

UK / pik /

B1
  • noun
  • Part of a cap that sticks out over your eyes
  • The very top of a mountain
  • State when something is at its best
  • Time or point when the highest level occurs
  • verb
  • To reach the highest or best point

respond

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US / rɪ'spɒnd /

UK / rɪˈspɑnd /

A2
  • verb
  • To answer something or someone
  • To have a good reaction to e.g. medical treatment

should

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US / ʃʊd /

UK / ʃʊd /

A1
  • other
  • Used to indicate what is proper or reasonable

science

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US / 'saɪəns /

UK / ˈsaɪəns /

A2
  • noun
  • Study of the physical world, based on facts

after

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US / 'ɑ:ftə(r) /

UK / ˈæftɚ /

A1
  • adverb
  • Later than another time, or behind something
  • conjunction
  • Following something before
  • preposition
  • When an event happened or time has passed

already

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US / ɔ:lˈredi /

UK / ɔlˈrɛdi /

A1
  • adverb
  • Having happened or been done before this time

appear

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US / ə'pɪə(r) /

UK / əˈpɪr /

A1
  • verb
  • To be seen, become visible; come into sight
  • To seem to be
  • To act in a play, movie, or be mentioned in media

describe

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US / dɪ'skraɪb /

UK / dɪˈskraɪb /

A1
  • verb
  • To tell the appearance, sound, smell of something

forth

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US / fɔ:θ /

UK / fɔrθ, forθ /

B1
  • adverb
  • So as to be seen; out
  • Outward or forward in space, time

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

intuitive

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US / ɪnˈtju:ɪtɪv /

UK / ɪnˈtuɪtɪv, -ˈtju- /

B2
  • adjecitve
  • Able to understand by feeling rather than fact

itself

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US / ɪtˈself /

UK / ɪtˈsɛlf /

A1
  • pronoun
  • Referring to it

repulsion

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US / rɪˈpʌlʃn /

UK / rɪˈpʌlʃən /

C1
  • noun
  • Feeling of being repelled by something

spontaneously

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US / spɒn'teɪnɪəslɪ /

UK / spɔnˈtenɪəslɪ /

B1
  • adverb
  • In a sudden, unplanned way

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

team

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US / ti:m /

UK / tim /

A1
  • noun
  • Group of people working on a task together
  • Group of people playing a sport together

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

astounding

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US / əˈstaʊndɪŋ /

UK / əˈstaʊndɪŋ /

C1
  • verb
  • To surprise someone greatly

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

contract

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US / 'kɒntrækt /

UK / 'kɑ:ntrækt /

A1
  • noun
  • Legal agreement, e.g. for doing work for money
  • Agreement to pay someone to kill a person
  • verb
  • To become ill as a result of getting a disease
  • To make an agreement for doing work for money
  • To reduce in size, length due to heat loss
  • To reduce the amount of

greece

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US / ɡri:s /

UK / ɡri:s /

A1
  • noun
  • A republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and

particle

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US / ˈpɑ:tɪkl /

UK / ˈpɑrtɪkəl /

B1
  • noun
  • Adverb or preposition that joins with a verb
  • Tiny piece or quantity of something

reality

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US / rɪ'ælətɪ /

UK / riˈælɪti /

A2
  • noun
  • What is true, as opposed to what is imagined

setup

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US / 'setʌp /

UK / ˈsɛtˌʌp /

B2
  • noun
  • Way something is organized or arranged

story

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US / 'stɔ:rɪ /

UK / ˈstɔri, ˈstori /

A1
  • noun
  • One of many floors or levels in a building
  • Account or description of how something happened

true

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US / tru: /

UK / tru: /

A1
  • adjecitve
  • Agreeing with the facts; not false; real or actual

ancient

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US / 'eɪnʃənt /

UK / ˈenʃənt /

A2
  • adjecitve
  • Very old; having lived a very long time ago

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

bread

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US / bred /

UK / brɛd /

A1
  • noun
  • Money or earnings
  • Baked food made from flour, used in sandwiches

correspond

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US / ˌkɒrəˈspɒnd /

UK / ˌkɔ:rəˈspɑ:nd /

B1
  • verb
  • To have similarity or equality with something
  • To write letters or emails to someone

hey

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US / heɪ /

UK / he /

A1
  • exclamation
  • What you say when you want someone's attention

intact

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US / ɪn'tækt /

UK / ɪn'tækt /

B1
  • adjecitve
  • Being complete, without damaged or missing parts

issue

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US / 'ɪʃu: /

UK / ˈɪʃu /

A2
  • noun
  • Important topic discussed, debated or argued over
  • Single edition of a magazine
  • verb
  • To make something available to be used or sold
  • To deliver a statement, etc. in an official manner

real

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US / rɪəl /

UK / ˈriəl, ril /

A1
  • adjecitve
  • Actually existing or happening, not imagined
  • Being important or special

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

abandon

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US / ə'bændən /

UK / əˈbændən /

B1
  • noun
  • Wild, carefree behavior
  • verb
  • To discard or intentionally get rid of an item
  • To withdraw your support, or leave someone
  • To stop doing or having (hope, plans); give up
  • To leave a place, car and not go back
  • To surrender to a desire, with little self-control

base

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US / beɪs /

UK / bes /

A2
  • noun
  • Place military personnel live, train, and operate
  • Bottom part of an object that touches a surface
  • Unit of counting, e.g. 10 for counting
  • Most important idea or ingredient to add others
  • Origin or start from which something came
  • Main place where an organization or a person works
  • verb
  • To use as the starting point or origin for
  • To have as the main location for (company, etc.)

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

certainly

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US / ˈsə:tnli /

UK / ˈsɚtnli /

A1
  • adverb
  • Sure; of course

galaxy

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US / 'ɡæləksɪ /

UK / ˈɡæləksi /

B2
  • noun
  • A group of stars and planets in space

hope

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US / həʊp /

UK / hop /

A1
  • noun
  • When you wish something will happen; what you wish
  • verb
  • To expect and want something to happen

hopefully

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US / ˈhəʊpfəli /

UK / ˈhopfəli /

A2
  • adverb
  • In a manner wishing something to happen

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

major

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US / 'meɪdʒə(r) /

UK / ˈmedʒɚ /

A2
  • adjecitve
  • Main league; esp. referring to American baseball
  • Important, serious, or large in scope, size
  • noun
  • High-ranking officer in the army
  • Main subject you study at university
  • verb
  • To study a particular subject at university

until

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US / ənˈtɪl /

UK / ʌnˈtɪl /

A1
  • conjunction
  • Up to; to a time when something happens
  • preposition
  • Before (a specific time)

tenet

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US / ˈtenɪt /

UK / ˈtɛnɪt /

B2
  • noun
  • Principle or belief, usually religious

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

come

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US / kʌm /

UK / kʌm /

A1
  • verb
  • To arrive at a place
  • (Of mail) to be delivered
  • To move toward someone; go with someone
  • To reach a certain point or state

company

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US / 'kʌmpənɪ /

UK / ˈkʌmpəni /

A1
  • noun
  • Good feeling from being with someone else
  • A business that sells things or provides services
  • Guests, especially in your home
  • Being with another person rather than alone

distance

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US / 'dɪstəns /

UK / ˈdɪstəns /

A2
  • noun
  • Lack of friendliness toward another person
  • Amount of space between two places or things
  • verb
  • To make it clear that you are not involved

experiment

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US / ɪk'sperɪmənt /

UK / ɪkˈspɛrəmənt /

A2
  • noun
  • Test performed to assess new ideas or theories
  • verb
  • To create and perform tests to research something
  • To try something new that you haven't tried before

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

literally

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US / ˈlɪtərəli /

UK / ˈlɪtərəli /

B1
  • adverb
  • So as to express the exact meaning of something
  • Used to say something is true, even if unlikely

match

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US / mætʃ /

UK / mætʃ /

A2
  • noun
  • Something that is equal to or the same as another
  • Small stick you strike to light a fire candle etc.
  • A sports competition between two people or teams
  • Person or thing that goes well with another
  • verb
  • To equal or be as good as something else
  • To work well or look good with something else

particular

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US / pəˈtɪkjələ(r) /

UK / pɚˈtɪkjəlɚ, pəˈtɪk- /

B2
  • adjecitve
  • One specific (one)
  • Having firm ideas about what is desirable
  • Being special or more than is typical

observe

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US / əbˈzɜ:v /

UK / əbˈzɜ:rv /

A2
  • verb
  • To celebrate a particular holiday/religious event
  • To obey or follow laws, rules, or customs
  • To watch carefully; to make a comment

pinpoint

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US / ˈpɪnpɔɪnt /

UK / ˈpɪnˌpɔɪnt /

B2
  • adjecitve
  • Exact, as of accuracy
  • verb
  • To locate something exactly
  • To identify or explain exactly

sardinia

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US / sɑ:ˈdinjə /

UK / sɑrˈdɪniə, -ˈdɪnjə /

A1
  • other
  • An island in the Mediterranean to the west of Italy

wave

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US / weɪv /

UK / wev /

A2
  • noun
  • Movement of sound, air or energy
  • Deep and strong emotion that is suddenly felt
  • Slightly curved shape in hair
  • Frequency of movement of objects together
  • Up and down movement of water in a lake or sea
  • Signal with your hand to say hello or goodbye
  • verb
  • To cause to move side to side or back and forth
  • To swing back and forth as a result of the wind
  • To move your hand or arm to say hello or goodbye

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

electrical

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US / ɪˈlektrɪkl /

UK / ɪˈlektrɪkl /

A2
  • adjecitve
  • Related or connected to electricity

electron

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US / ɪˈlektrɒn /

UK / ɪˈlektrɑ:n /

B2
  • noun
  • A negatively charged particle

jiggle

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US / ˈdʒɪgl /

UK / ˈdʒɪɡəl /

A1
  • verb
  • Move to and fro

normally

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US / ˈnɔ:məli /

UK / ˈnɔːrməli /

B1
  • adverb
  • In the manner that is usual or ordinary

photon

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US / ˈfəʊtɒn /

UK / ˈfoʊtɑ:n /

B2
  • noun
  • Particle with energy but no mass, electric charge

possibility

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US / ˌpɒsə'bɪlətɪ /

UK / ˌpɑsəˈbɪlɪti /

A2
  • noun
  • Something with a chance of happening or being true

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

two

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US / tu: /

UK / tu /

A1
  • number
  • 2

anything

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US / ˈeniθɪŋ /

UK / ˈɛniˌθɪŋ /

A1
  • pronoun
  • A thing of any kind

europe

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US / ˈjʊərəp /

UK / ˈjʊrəp /

A1
  • noun
  • A continent including Germany, France and Spain
  • other
  • The second smallest continent (actually a vast peninsula of Eurasia); the British use 'Europe' to re

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

over

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US / 'əʊvə(r) /

UK / ˈovɚ /

A1
  • adverb
  • Finished; no longer happening
  • Towards the ground/away from a standing position
  • noun
  • A set of six consecutive balls bowled in cricket
  • other
  • Finished
  • preposition
  • Showing the relation when a thing is above another
  • On or covering something
  • Above or across something
  • More than you need
  • From one side to the other
  • In the direction of; toward

repulsive

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US / rɪˈpʌlsɪv /

UK / rɪˈpʌlsɪv /

C1
  • adjecitve
  • Very unpleasant; that almost makes you feel sick

resource

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US / riˈsɔ:s /

UK / ˈriˌsɔrs, -ˌsors, -ˌzɔrs, -ˌzors, rɪˈsɔrs, -ˈsors, /

A2
  • noun
  • Something that can be used profitably; asset
  • An essential supply of something
  • Resourcefulness; ability to deal with problems
  • verb
  • To obtain (e.g. oil, gas) from its source

versa

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US / 'vɜ:sə /

UK / 'vɜ:sə /

C1
  • adverb
  • used to say that what you have just said is also true in the opposite order

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

displace

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US / dɪs'pleɪs /

UK / dɪsˈples /

B1
  • verb
  • To cause someone to move from their usual place
  • To substitute something with something else

dilute

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US / daɪˈlu:t /

UK / daɪˈlut, dɪ- /

B2
  • verb
  • To make something weaker or less efficient

far

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US / fɑ:(r) /

UK / fɑr /

A1
  • adjecitve
  • A long way away
  • Being a long way away
  • adverb
  • To a large degree or extent

leave

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US / li:v /

UK / liv /

A1
  • noun
  • Permission to do something
  • Vacation time; time off work
  • verb
  • To go away from; depart
  • To gift property to someone after you die
  • To allow something to continue happening
  • To let something remain unused or available
  • To let something or someone remain somewhere

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

couple

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US / 'kʌpl /

UK / ˈkʌpəl /

A2
  • noun
  • Two people in a romantic relationship
  • Two of something; two people; a pair
  • verb
  • To join something to something else
  • (Two animals) to engage in sexual relations
  • To put two people or things together

familiar

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US / fəˈmɪliə(r) /

UK / fəˈmɪljɚ /

A2
  • adjecitve
  • Well-known or easily recognized

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

investigate

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US / ɪn'vestɪɡeɪt /

UK / ɪnˈvɛstɪˌɡet /

A2
  • verb
  • To try to find out facts; to carry out research

maintain

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US / meɪn'teɪn /

UK / menˈten /

A2
  • verb
  • To keep saying something a certain way
  • To keep (machine) working by checking, repairing
  • To keep, exist or continue without changing

name

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US / neɪm /

UK / nem /

A1
  • noun
  • What something or someone is called
  • verb
  • To state what someone is called, e.g. John

slash

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US / slæʃ /

UK / slæʃ /

B2
  • noun
  • Line ( / ) used in writing
  • Long, deep cut, caused by a sharp object
  • verb
  • To cut violently with a sharp object
  • To decrease something by a large amount

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

hang

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US / hæŋ /

UK / hæŋ /

A2
  • verb
  • To attach a picture, photograph etc. onto a wall
  • To float, move softly, or remain in the air
  • To kill by putting a rope around neck and dropping
  • To remain undecided, unsolved or unclear

large

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US / lɑ:dʒ /

UK / lɑ:rdʒ /

A1
  • adjecitve
  • Big; of great size; broad, tall, wide, or fat

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

fix

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US / fɪks /

UK / fɪks /

A2
  • noun
  • Answer to a problem
  • verb
  • To arrange or prepare something
  • To attach something so it will not move or change
  • To dishonestly arrange the result of a game
  • To make an animal unable to produce young
  • To make something whole or able to work again

mine

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US / maɪn /

UK / maɪn /

A1
  • noun
  • A bomb hidden in the ground or the sea
  • Rich source of material or information
  • Place under the ground where coal, etc. is dug out
  • pronoun
  • That thing that belongs to me
  • verb
  • To place a bomb in the ground or the sea
  • To dig into the earth or sea to obtain minerals

italian

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US / ɪ'tælɪən /

UK / ɪˈtæljən /

A1
  • adjecitve
  • Concerning the culture and people of Italy
  • noun
  • Person from Italy

maybe

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US / ˈmeɪbi /

UK / ˈmebi /

A1
  • adverb
  • Possibly but not certainly; perhaps

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

quite

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US / kwaɪt /

UK / kwaɪt /

A1
  • adverb
  • Not very; fairly
  • Very; In a complete or total manner

reasonable

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US / ˈri:znəbl /

UK / ˈrizənəbəl /

A2
  • adjecitve
  • Being somewhat good, but not great
  • Fair and sensible; appropriate

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

definition

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US / ˌdefɪˈnɪʃn /

UK / ˌdɛfəˈnɪʃən /

A2
  • noun
  • Explanation of word's meaning, as in dictionaries
  • The sharpness of an image on a screen
  • Visual clearness in a photo or on a screen

fabric

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US / ˈfæbrɪk /

UK / ˈfæbrɪk /

B1
  • noun
  • Cloth or material
  • Basic structure

famously

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US / ˈfeɪməsli /

UK / ˈfeməsli /

B1
  • adverb
  • In a manner or to an extent that is well known

law

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US / lɔ: /

UK / lɔ /

A1
  • noun
  • Field of study that relates to the legal profession
  • A rule made and enforced by a government
  • System or rules made by the government

equal

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US / 'i:kwəl /

UK / ˈikwəl /

A1
  • adjecitve
  • Same in shape, size, or number
  • verb
  • To add up or be the same as

measure

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US / ˈmeʒə(r) /

UK / ˈmɛʒɚ /

A1
  • noun
  • Plan to achieve a desired result
  • Tool used to calculate the size of something
  • verb
  • To determine the value or importance of something
  • To calculate size, weight or temperature of

planet

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US / 'plænɪt /

UK / ˈplænɪt /

A2
  • noun
  • One of the bodies that orbit the sun

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

operate

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US / ˈɒpəreɪt /

UK / ˈɑ:pəreɪt /

A1
  • verb
  • To control or handle something, such as a machine
  • To control or manage something such as a business
  • To be working or being used
  • To perform surgery on someone

structure

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US / ˈstrʌk.tʃə /

UK / ˈstrʌk.tʃɚ /

A2
  • noun
  • The way in which the parts of a system or object are arranged or organized, or a system arranged in
  • verb
  • To plan, organize, or arrange the parts of something

cloud

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US / klaʊd /

UK / klaʊd /

A1
  • noun
  • A mass of smoke or mist hanging in the air
  • verb
  • To confuse the mind/judgment of a person
  • (Of the sky) to get darker and fill with clouds
  • To make (glass, etc.) difficult to see through
  • To make an activity less pleasant or enjoyable
  • (Of person's face, etc.) to show worry/anger

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

effect

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US / ɪ'fekt /

UK / ɪˈfɛkt /

A1
  • noun
  • An advantage, benefit
  • Change brought about by a cause; result

description

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US / dɪˈskrɪpʃn /

UK / dɪˈskrɪpʃən /

A2
  • noun
  • Explanation of what something is like, looks like

credit

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US / 'kredɪt /

UK / ˈkrɛdɪt /

A2
  • adjecitve
  • Having a positive amount of money
  • noun
  • System to buy something and pay for it later
  • Points earned instead of money
  • Quality of having a good reputation for a reason
  • Points earned towards a university degree
  • verb
  • To add a certain amount of money to a total
  • To recognize someone's achievements or help

pauli

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US / ˈpætənd /

UK / ˈpætɚnd /

A1

represent

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US / ˌreprɪ'zent /

UK / ˌrɛprɪˈzɛnt /

A2
  • verb
  • To depict art objects, figures, scenes; to portray
  • To show or describe something in a particular way
  • To act on behalf of others in government
  • To act or speak for another person or other people

prediction

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US / prɪˈdɪkʃn /

UK / prɪˈdɪkʃən /

A2
  • noun
  • A statement of what will happen next

whether

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US / ˈweðə(r) /

UK / ˈhwɛðɚ, ˈwɛð- /

A1
  • conjunction
  • If something will happen or not

scale

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US / skeɪl /

UK / skel /

A2
  • noun
  • Size, level, or amount when compared
  • Small hard plates that cover the body of fish
  • Device that is used to weigh a person or thing
  • Range of numbers from the lowest to the highest
  • Dimensions or size of something
  • verb
  • To change the size of but keep the proportions
  • To climb something large (e.g. a mountain)
  • To remove the scales of a fish

support

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US / səˈpɔ:t /

UK / səˈpɔrt, -ˈport /

A1
  • noun
  • Assistance or advice given to someone
  • Evidence that helps prove something is true
  • A thing to hold up or prevent from falling down
  • verb
  • To give assistance or advice to someone
  • To help prove or show that something is true
  • To hold up or prevent from falling down

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

cut

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US / kʌt /

UK / kʌt /

A1
  • noun
  • Act/instance of reducing the size or amount of
  • Small opening made using a sharp object, knife
  • A wound on someone's skin caused by a sharp object
  • verb
  • To reduce the size or amount of something
  • To use knife or scissors to divide, open surfaces

apply

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US / ə'plaɪ /

UK / əˈplaɪ /

A1
  • verb
  • To spread a substance or liquid over a surface
  • To commit your time and effort to doing something
  • To make something useful in a certain situation
  • To be relevant for a situation
  • To ask formally for (job, permission etc.)

demonstrate

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US / 'demənstreɪt /

UK / ˈdɛmənˌstret /

A2
  • verb
  • To display a feeling or ability openly
  • To protest about something often as a group
  • To prove or make clear by reasoning or evidence
  • To show how something works (e.g. product)

expansion

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US / ɪkˈspænʃn /

UK / ɪkˈspænʃən /

B2
  • noun
  • Making or becoming larger

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

good

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US / ɡʊd /

UK / ɡʊd /

A1
  • adjecitve
  • Proper, appropriate or right
  • (Of an amount) enough; plenty
  • Excellent; high quality
  • Acting well or properly; of moral character
  • In a positive or happy emotional state
  • noun
  • Advantage or benefit

inward

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US / ˈɪnwəd /

UK / ˈɪnwərd /

B1
  • adverb
  • At the inside of

overlap

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US / ˌəʊvəˈlæp /

UK / ˌoʊvərˈlæp /

B1
  • noun
  • Amount shared in the same space, form, idea
  • verb
  • To lie over or cover a part of something else
  • To happen at the same time as another event
  • To share qualities or functions

signal

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US / 'sɪɡnəl /

UK / ˈsɪɡnəl /

A2
  • adjecitve
  • Most important or most noticeable
  • noun
  • Movement of a hand or other means to send messages
  • Act/sound that tells people to do/start something
  • Road-side lights that direct traffic to go or stop
  • Sound and light waves carrying TV and radio data
  • verb
  • To be evidence/an indication something will happen
  • To make a noise or motion to tell someone to start

underground

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US / ˈʌndəgraʊnd /

UK / ˈʌndərgraʊnd /

B1
  • adjecitve
  • (Being or living) under the surface of the earth
  • noun
  • Secret group organized to overthrow a government
  • Subway system, e.g. in London

star

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US / stɑ:(r) /

UK / stɑr /

A1
  • noun
  • Very famous person, usually an entertainer
  • Someone who does something very well
  • Your horoscope
  • A bright planet of hot gas in the night sky
  • A 5-6 sided asterisk-shape
  • verb
  • To perform or play a main role in a movie, play
  • To do something very well
  • To mark with a 5-6 sided asterisk-shape

zero

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US / ˈzɪərəʊ /

UK / ˈzɪroʊ /

A1
  • noun
  • Temperature when water turns to ice
  • number
  • Number 0
  • verb
  • To set a scale or other device to show 0

become

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US / bɪ'kʌm /

UK / bɪˈkʌm /

A1
  • verb
  • To begin to be; grow to be; develop into
  • To be suitable for a particular job or role

behaviour

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US / bɪˈheɪvjə(r) /

UK / bɪˈhevjɚ /

A1
  • noun
  • The way a person or thing acts; manner

carry

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US / ˈkæri /

UK / ˈkæri /

A1
  • verb
  • To have a child, be pregnant
  • To have a disease you might give to others
  • (Of stores) to sell a particular product
  • To hold something and move it to another place
  • To travel a long distance (sound)
  • To support the weight or burden of something

explanation

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US / ˌekspləˈneɪʃn /

UK / ˌɛkspləˈneʃən /

A2
  • noun
  • Details or reasons given to make something clear

inflatable

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US / ɪnˈfleɪtəbl /

UK / ɪnˈfletəbəl /

B1
  • adjecitve
  • Designed to be filled with air or gas

pack

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US / pæk /

UK / pæk /

A1
  • noun
  • Bag carried on the back of donkey, etc.
  • Group of people, animals, or objects
  • verb
  • To put things in a suitcase to go on a trip
  • To crowd a place with a large amount of things
  • To put something into a container to store it

periodic

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US / ˌpɪəriˈɒdɪk /

UK / ˌpɪriˈɑ:dɪk /

A2
  • adjecitve
  • Happening regularly, but not frequently

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

tiny

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US / 'taɪnɪ /

UK / ˈtaɪni /

A2
  • adjecitve
  • Very, very small

toy

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US / tɔɪ /

UK / tɔɪ /

A2
  • adjecitve
  • Something small in size compared to an original
  • noun
  • Things children play with, as dolls or small cars
  • verb
  • To play with (your food, someone's feelings)

currently

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US / ˈkʌrəntli /

UK / ˈkʌrənt(ə)li /

A2
  • adverb
  • Happening or being in the present time

expect

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US / ɪk'spekt /

UK / ɪkˈspɛkt /

A1
  • verb
  • To believe something is probably going to happen

internet

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US / ˈɪn.tə.net /

UK / ˋɪntɚ͵nɛt /

A1
  • noun
  • Worldwide computer network system

outro

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US / 'u:trəʊ /

UK / 'u:troʊ /

A1
  • noun
  • The concluding section of a piece of music or a radio or television program.

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

weigh

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US / weɪ /

UK / weɪ /

A2
  • verb
  • To balance things against each other
  • To consider something carefully to form an opinion
  • To determine the weight of, using scales

weight

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US / weɪt /

UK / wet /

A2
  • noun
  • How heavy something is
  • Metal object to measure how heavy something is
  • Importance, power, and influence person, thing has
  • A source of worry, sadness, or emotional stress

yet

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US / jet /

UK / jɛt /

A1
  • adverb
  • At a later time (used after ‘not’)
  • (Used to emphasize that thing is, will be greater)
  • Eventually; at a future time
  • Until now; up to the present
  • conjunction
  • Adding to what has been said, often as a contrast

video

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US / 'vɪdɪəʊ /

UK / ˈvɪdiˌo /

A2
  • adjecitve
  • Of a moving film, with sound
  • noun
  • Recording capturing action with sound
  • verb
  • To make a moving film of, with sound

bury

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US / 'berɪ /

UK / ˈbɛri /

B1
  • verb
  • To put something into the ground and cover it

lambda

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US / ˈlæmdə /

UK / 'læmdə /

C1
  • noun
  • 11th letter of the Greek alphabet

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

experimental

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US / ɪkˌsperɪˈmentl /

UK / ɪkˌspɛrəˈmɛntl /

A2
  • adjecitve
  • Using techniques that are different or untried

randomly

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US / 'rændəmlɪ /

UK / 'rændəmlɪ /

B1
  • adverb
  • With no pattern or clear purpose; by chance

seriously

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US / ˈsɪəriəsli /

UK / ˈsɪriəsli /

B1
  • adverb
  • Involving or requiring great thought or study

towards

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US / tə'wɔ:dz /

UK / 'təuədz, twɔ:dz /

A1
  • preposition
  • In the direction of someone or something

ask

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US / ɑ:sk /

UK / æsk /

A1
  • verb
  • To say to someone that you want something

exact

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US / ɪɡ'zækt /

UK / ɪɡˈzækt /

A2
  • adjecitve
  • Completely correct; accurate; specific
  • verb
  • To get something, sometimes using force

conductor

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US / kənˈdʌktə(r) /

UK / kənˈdʌktɚ /

A2
  • noun
  • Material which can transfer electricity through it
  • Person who leads a musical group
  • Employee in charge of a train, bus etc.

limit

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US / 'lɪmɪt /

UK / ˈlɪmɪt /

A2
  • noun
  • Point beyond which it is not possible to go
  • verb
  • To stop or prevent an increase past a point

source

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US / sɔ:s /

UK / sɔrs, sors /

A2
  • adjecitve
  • Produces or provides what is wanted or needed
  • noun
  • Piece of information; a person giving information
  • Place from which something necessary comes
  • verb
  • To get, e.g. a raw material, from somewhere

set

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US / set /

UK / sɛt /

A1
  • adjecitve
  • Prepared for something; ready
  • noun
  • Complete group of something
  • Place where a television show or movie is filmed
  • Group of games in a tennis match
  • Device that receives radio or television signals
  • verb
  • To make a clock state or ring at a particular time
  • To decide upon or choose something
  • To make something ready for use (e.g. table)
  • To decide on a price for something
  • To become hard (of glue, concrete etc.)
  • To be located in a specific place or time
  • To put (e.g. a vase) down carefully in a place
  • To put someone in a certain condition or state
  • (Of the sun) to go lower than the horizon

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

upcoming

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US / ˈʌpkʌmɪŋ /

UK / ˈʌpˌkʌmɪŋ /

C1
  • adjecitve
  • Occurring soon; approaching

traverse

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US / trəˈvɜ:s /

UK / trəˈvɜ:rs /

B2
  • verb
  • To pass across, over, or through

trough

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US / trɒf /

UK / trɔ:f /

B2
  • noun
  • Long open container for feeding farm animals
  • Low part between the tops of hills or waves

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

buoyancy

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US / 'bɔɪənsɪ /

UK / ˈbɔɪənsi, ˈbujən- /

B2
  • noun
  • Degree to which a thing floats on liquid or in air

capable

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US / 'keɪpəbl /

UK / ˈkepəbəl /

A2
  • adjecitve
  • Being able to do something very well; proficient

constant

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US / 'kɒnstənt /

UK / ˈkɑnstənt /

A2
  • adjecitve
  • Happening frequently or without pause
  • noun
  • Thing that happens always or at a regular rate

earth

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US / ɜ:θ /

UK / ɚθ /

A1
  • noun
  • Wire connecting an electrical device to the ground
  • The planet we live on
  • Soil in which we grow plants

extremely

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US / ɪkˈstri:mli /

UK / ɪk'strimlɪ /

B1
  • adverb
  • In a way that is much more than usual or expected

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

energetic

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US / ˌenəˈdʒetɪk /

UK / ˌɛnɚˈdʒɛtɪk /

A2
  • adjecitve
  • Possessing, exerting or displaying energy

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

seesaw

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US / 'si:sɔ: /

UK / ˈsiˌsɔ /

A1
  • noun
  • Playground balance children play on
  • verb
  • To move or ride up and down, like on a seesaw

under

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US / ˈʌndə(r) /

UK / ˈʌndɚ /

A1
  • adjecitve
  • In the same place as another thing, but lower
  • adverb
  • In a lower quantity or price than expected
  • preposition
  • According to the terms of an agreement or law
  • Managed or controlled by the authority of
  • Being of a lesser quality or amount than expected
  • Influenced or affected by something or someone
  • Less or lower in age, amount, size or number

definitely

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US / ˈdefɪnətli /

UK / ˈdefɪnətli /

A2
  • adverb
  • Without question; beyond doubt

cool

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US / ku:l /

UK / kul /

A1
  • adjecitve
  • Steady and calm when facing difficulties
  • Almost cold; not warm or hot
  • Smart or stylish in a way (young) people admire
  • Unfriendly in an indirect way; distant
  • verb
  • To make something decrease in temperature
  • (Of an emotion, etc.) to become less strongly felt

mass

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US / mæs /

UK / mæs /

B1
  • noun
  • Religious ceremony in some Christian churches
  • Large amount or number of something
  • Main or largest part of something
  • Large number of people considered as a whole
  • Amount of matter that an object has
  • verb
  • To gather people or things into a large group

sound

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US / saʊnd /

UK / saʊnd /

A1
  • adjecitve
  • Sensible, dependable and reliable
  • Unbroken or undisturbed, as of sleep
  • Firm or solid in structure
  • Sane; not mentally ill
  • Clearly reasoned; involving sense, good judgment
  • noun
  • Unique quality that characterizes a style of music
  • Waves traveling in air or water that can be heard
  • verb
  • To seem or appear to be, from what was said
  • To say in a clear deliberate manner
  • To make a noise, e.g. to ring a bell

rip

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US / rɪp /

UK / rɪp /

B1
  • noun
  • A long tear in something, e.g. a piece of cloth
  • verb
  • To tear or split roughly or cause to tear or split
  • To become torn, opened, or split apart forcefully
  • To remove or take by pulling it forcefully

populate

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US / 'pɒpjʊleɪt /

UK / ˈpɑpjəˌlet /

A2
  • verb
  • To live in a particular area, as a group

strangely

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US / ˈstreɪndʒli /

UK / ˈstrendʒlɪ /

A2
  • adverb
  • In an unusual, odd or surprising way

trap

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US / træp /

UK / træp /

A2
  • noun
  • Device used for catching animals
  • Vehicle pulled by a single horse
  • Area or hazard on a golf course
  • Someone's mouth
  • Uncomfortable event that is hard to escape
  • verb
  • To use a device to catch animals or people
  • To hold, e.g. a nerve, so that it cannot move
  • To catch or prevent someone from escaping
  • To trick someone
  • To put into a situation you can't escape from

sardinian

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US / /

UK / /

A1
  • other
  • A native or inhabitant of Sardinia
  • Of or relating to or characteristic of Sardinia or its people or its language
  • Italian dialect spoken in Sardinia; sometimes considered a separate language with many loan words fr

such

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US / sʌtʃ /

UK / sʌtʃ /

A1
  • determiner
  • Being similar to
  • (Thing) as previously stated or referred to
  • adverb
  • (Used to emphasize the quality of an adjective)

warm

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US / wɔ:m /

UK / wɔrm /

A1
  • adjecitve
  • Friendly, sincere and kind to others
  • Being friendly or sincere
  • Slightly hot; not very hot
  • verb
  • To become more friendly or to like something
  • To make something hotter

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

acceleration

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US / əkˌseləˈreɪʃn /

UK / ækˌsɛləˈreʃən /

B1
  • noun
  • Increase in the speed or rate of something

greek

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US / gri:k /

UK / ɡrik /

A1
  • adjecitve
  • Concerning the culture and people of Greece
  • noun
  • Person from Greece

light

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US / laɪt /

UK / laɪt /

A1
  • adjecitve
  • Being bright making it easy to see; not dark
  • Being pale and lacking darkness of color
  • Not heavy; weighing only a little
  • adverb
  • Carrying few bags when traveling
  • noun
  • A source of energy that makes a room or area bright
  • Way in which something or someone is understood
  • verb
  • To cause something to burn; put a burning match to
  • To provide a way to see ahead

molecule

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US / ˈmɒlɪkju:l /

UK / ˈmɑlɪˌkjul /

B2
  • noun
  • Two or more atoms chemically combined

pop

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US / pɒp /

UK / pɑp /

B2
  • adjecitve
  • Type of music or art popular with many people
  • noun
  • Sweet soda drink
  • verb
  • To cause something to open or burst suddenly
  • To go to or in a place for a brief period of time

stuff

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US / stʌf /

UK / stʌf /

A1
  • noun
  • Generic description for things, materials, objects
  • verb
  • To push material inside something, with force

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

though

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US / ðəu /

UK / ðo /

A1
  • adverb
  • Although, despite the fact that

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

short

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US / ʃɔ:t /

UK / ʃɔrt /

A1
  • adverb
  • Less than what is needed
  • Suddenly stopping what you are saying or doing
  • verb
  • (Of electric circuit) to spark because faulty
  • adjecitve
  • Measuring a small distance
  • Happening for a small amount of time
  • Unfriendly or rude

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

solid

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US / 'sɒlɪd /

UK / ˈsɑlɪd /

A2
  • adjecitve
  • Being able to be trusted; reliable
  • Substance that is hard or of fixed shape
  • Being well made and expected to last long
  • Having no space or emptiness inside
  • Being made entirely of one material or substance
  • noun
  • Something firm or hard; not gas or liquid

depend

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US / dɪˈpend /

UK / dɪˈpend /

B1
  • verb
  • Be controlled or determined by (someone/something)

massless

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US / ˈmæslɪs /

UK / ˈmæsləs /

A1

equation

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US / ɪˈkweɪʒn /

UK / ɪˈkweʒən, -ʃən /

B1
  • noun
  • Mathematical statement showing things to be equal
  • Complex set of different facts, ideas or issues

question

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US / 'kwestʃən /

UK / ˈkwɛstʃən /

A1
  • noun
  • Issue or problems you are dealing with
  • What you ask about; issue
  • verb
  • To ask for or try to get information
  • To have or express concerns or uncertainty

object

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US / 'ɒbdʒɪkt /

UK / ˈɑbdʒɪkt /

A2
  • noun
  • Something you can see or touch, but is not alive
  • Goal or purpose of a particular plan or activity
  • The thing that the action of a verb acts upon
  • verb
  • To disagree; to protest against an idea or plan

vice

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US / ˌvaɪs /

UK / ˌvaɪ.sə /

B2
  • adverb
  • used to say that what you have just said is also true in the opposite order

amount

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US / ə'maʊnt /

UK / əˈmaʊnt /

A1
  • noun
  • Quantity of something
  • verb
  • To add up to a certain figure

anywhere

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US / ˈeniweə(r) /

UK / ˈeniwer /

A1
  • adverb
  • To any extent or degree (often used with not)
  • In, at or to any place
  • other
  • Use to indicate limits or variation

difference

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US / 'dɪfrəns /

UK / ˈdɪfərəns, ˈdɪfrəns /

A1
  • noun
  • A thing or issue that people do not agree about
  • Not of the same kind; unlike other things

field

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US / fi:ld /

UK / fild /

A1
  • noun
  • Area of study, such as physics or biology
  • Piece of land used to grow crops/raise animals
  • Open area of land, especially without buildings
  • Grassed area where you play some sports
  • verb
  • To respond to something or answer a question
  • To catch or stop a ball during a game

head

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US / hed /

UK / hɛd /

A1
  • noun
  • Counter for the number of cattle
  • Natural mental ability or intelligence
  • Leader or person with the greatest authority
  • Mind; mental ability; mental state
  • Side of a coin with a head on it
  • Top part of your body with eyes and a mouth
  • Starting point of something, e.g. a river
  • verb
  • To hit a ball with your head in a game
  • To be first or at the front or top (e.g. a list)
  • To travel or move toward a particular place; To go in a particular direction
  • To become the leader of something
  • To lead or be responsible for something

never

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US / 'nevə(r) /

UK / ˈnɛvɚ /

A1
  • adverb
  • Not ever; not at any time

middle

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US / 'mɪdl /

UK / ˈmidl /

A1
  • adjecitve
  • Equal distance from extremes
  • noun
  • Place that is halfway between two things

spacetime

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US / s'peɪstaɪm /

UK / s'peɪstaɪm /

A1
  • noun
  • The concepts of time and three-dimensional space regarded as fused in a four-dimensional continuum.

special

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US / 'speʃl /

UK / ˈspɛʃəl /

A1
  • adjecitve
  • Being additional or extra
  • Different, better or greater than normal
  • noun
  • Heavily discounted sales item

blame

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US / bleɪm /

UK / blem /

A2
  • noun
  • Act of saying someone did something bad
  • verb
  • To say someone is responsible for something bad

hubble

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US / ˈhʌb(ə)l /

UK / ˈpaʊəl /

A1

letter

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US / 'letə(r) /

UK / ˈlɛtɚ /

A1
  • noun
  • One of the 26 parts of the English alphabet
  • Message you put in an envelope and send by post

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

proton

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US / ˈprəʊtɒn /

UK / ˈproʊtɑ:n /

B2
  • noun
  • Tiny part of atom with positive electrical charge

quantum

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US / ˈkwɒntəm /

UK / ˈkwɑ:ntəm /

B2
  • noun
  • The smallest unit or amount of energy

building

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US / ˈbɪldɪŋ /

UK / ˈbɪldɪŋ /

A1
  • noun
  • A structure with a roof and walls, e.g. a house
  • verb
  • To establish e.g. a reputation, over time
  • To construct a house, office, factory

fill

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US / fɪl /

UK / fɪl /

A1
  • noun
  • Act of filling; amount used to make something full
  • verb
  • To make something full
  • To move into all parts of an area
  • To repair a surface by adding a substance to it
  • To use (time); to do something during

prove

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US / pru:v /

UK / pruv /

A2
  • verb
  • To demonstrate truth by providing evidence

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

throw

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US / θrəʊ /

UK / θroʊ /

A1
  • noun
  • Arm movement to make a thing fly through the air
  • Loose cloth or blanket (usually over a chair)
  • Forcibly putting someone on the ground
  • verb
  • To use your arm to make something fly in the air
  • To move part of your body suddenly and forcefully
  • To confuse or upset someone
  • (E.g. judo) to forcibly put someone on the ground
  • To put something somewhere suddenly and roughly

abide

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US / ə'baɪd /

UK / əˈbaɪd /

B2
  • verb
  • To live somewhere (formal, old-fashioned)

bounce

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US / baʊns /

UK / baʊns /

B1
  • noun
  • A person's energy or confidence
  • Quality causing a person's hair to appear healthy
  • verb
  • To move around energetically, playfully
  • To forcibly remove a person from a bar, nightclub
  • (Of check) to be rejected due to inadequate funds
  • To strike a surface and rapidly change direction
  • To move energetically in an up and down motion

death

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US / deθ /

UK / dɛθ /

A2
  • noun
  • When someone dies; the end of life

huge

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US / hju:dʒ /

UK / hjudʒ /

A2
  • adjecitve
  • Very very large

else

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US / els /

UK / ɛls /

A1
  • adverb
  • Otherwise; if you fail to
  • (Of person place thing etc.) besides; in addition

oven

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US / ˈʌvn /

UK / ˈʌvən /

B1
  • noun
  • Kitchen appliance you put food in to bake, roast

move

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US / mu:v /

UK / muv /

A1
  • noun
  • Act of moving a playing piece in chess, etc.
  • An action; doing something
  • Step taken to achieve a goal
  • verb
  • To cause someone to have certain emotions
  • To cause something to change to a different place
  • To change where people live or a business operates
  • To take action to do or achieve something

reflect

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US / rɪ'flekt /

UK / rɪˈflɛkt /

A2
  • verb
  • To indicate or be a sign of something
  • To bounce back light, heat, sound from a surface
  • To show an image in glass, water, a mirror etc.
  • To think of something seriously and carefully

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

yes

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US / jes /

UK / jɛs /

A1
  • adverb
  • Way to say you agree or will do something

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

cosmological

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US / ˌkɒzmə'lɒdʒɪkl /

UK / ˌkɒzmə'lɒdʒɪkl /

B2
  • adjecitve
  • Dealing with the origin, history of the universe

fast

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US / fɑ:st /

UK / fæst /

A1
  • adjecitve
  • In a way that is difficult to move or change
  • Moving or able to move quickly
  • Showing time that is later than the actual time
  • adverb
  • With a great deal of speed
  • noun
  • Period of time when a person chooses not to eat
  • verb
  • To refuse food for a long time

empty

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US / 'emptɪ /

UK / ˈɛmpti /

A1
  • adjecitve
  • Containing nothing; with no contents
  • Without emotions, feelings, meaning or force
  • noun
  • Item, e.g. a bottle, whose contents have been used
  • verb
  • To remove the contents from something

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

strange

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US / streɪndʒ /

UK / strendʒ /

A1
  • adjecitve
  • Unusual or odd; surprising because unexpected

top

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US / tɒp /

UK / tɑp /

A1
  • adjecitve
  • Being good or great; excellent
  • Being the most in degree or quality
  • noun
  • Item of clothing covering shoulders to waist, hips
  • A cover or lid
  • Part (e.g. road) that is the furthest away
  • Highest or upper part or point of something
  • Best or highest status or position
  • Flat upper surface or edge of an object
  • Child's toy that spins on its point
  • Upper section or leaves of fruits and vegetables
  • Winning in a sport or contest
  • verb
  • To be higher or larger than a specific value
  • To arrive at the highest point of something
  • To put a cover or layer or over something
  • To kill; murder
  • To hold the highest position on a list
  • To be more important, successful or better than
  • To beat someone or win at a game

unofficially

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US / ˌʌnə'fɪʃəlɪ /

UK / ˌʌnə'fɪʃəlɪ /

B1
  • adverb
  • Not done in a properly authorized way

super

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US / ˈsu:pə(r) /

UK / ˈsupɚ /

A2
  • adjecitve
  • Of the highest quality; great; marvelous

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

close

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US / kləʊz /

UK / kloʊz /

A1
  • adjecitve
  • Almost; near
  • (Of a friend) well-known; liked by others
  • Being near or related
  • Similar; nearly the same
  • verb
  • To come progressively nearer to something
  • To end; to bring to an end
  • To make something shut; stop from being open

distant

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US / 'dɪstənt /

UK / ˈdɪstənt /

B1
  • adjecitve
  • Unfriendly; cold
  • Existing or happening far away in place or time
  • (Of relationships) not being closely related

link

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US / lɪŋk /

UK / lɪŋk /

A2
  • noun
  • Any one of the rings that are part of a chain
  • Connection between two or more things or people
  • Webpage item you click to go to another webpage
  • verb
  • To join or connect together

slight

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US / slaɪt /

UK / slaɪt /

B1
  • adjecitve
  • Small (amount, quality)
  • Appearing thin, delicate and physically weak
  • noun
  • Rude and disrepectful treatment
  • verb
  • To ignore or treat rudely and with no respect

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

update

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US / ˌʌpˈdeɪt /

UK / ʌpˈdet /

B1
  • noun
  • Addition of a current version of something
  • New information or data to make more current
  • verb
  • To download the latest version of software
  • To make more current or modern

atom

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US / 'ætəm /

UK / ˈætəm /

B1
  • noun
  • Smallest bit that matter can be broken down into

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

cosmos

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US / ˈkɒzmɒs /

UK / ˈkɑ:zmoʊs /

B2
  • noun
  • The universe

everything

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US / 'evrɪθɪŋ /

UK / ˈɛvriˌθɪŋ /

A1
  • pronoun
  • All of the things mentioned

principle

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US / ˈprɪnsəpl /

UK / ˈprɪnsəpəl /

A2
  • noun
  • Moral rule or belief governing a person's behavior
  • Natural law that explains how things work

tilt

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US / tɪlt /

UK / tɪlt /

B2
  • noun
  • Position in which one side is above the other
  • verb
  • To change to a newly preferred idea or opinion
  • To move something away from the upright
  • To influence (public opinion) in a certain way

volume

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US / ˈvɒlju:m /

UK / ˈvɑljum, -jəm /

A2
  • noun
  • Number or amount of something e.g. sales
  • Amount of space that something takes up
  • One book that is part of a set of books
  • Level of sound produced by radio or television

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

swap

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US / swɒp /

UK / swɑp /

B2
  • noun
  • A trade or exchange of goods without using money
  • verb
  • To exchange goods without spending money; trade

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

account

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US / ə'kaʊnt /

UK / əˈkaʊnt /

A1
  • noun
  • An advantage
  • Arrangement with a bank to keep your money for you
  • An invoice for things bought
  • Arrangement whereby you can use online services
  • A description, often written, of events; report

constantly

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US / ˈkɒnstəntli /

UK / ˈkɑnstəntlɪ /

B1
  • adverb
  • Frequently, or without pause

mechanic

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US / məˈkænɪk /

UK / mɪˈkænɪk /

B1
  • noun
  • A person who looks after/works with machinery

pretty

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US / 'prɪtɪ /

UK / ˈprɪti /

A1
  • adjecitve
  • Being attractive to the eye in a simple way
  • adverb
  • Very; to a great degree

observation

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US / ˌɒbzəˈveɪʃn /

UK / ˌɑbzɚˈveʃən /

B1
  • noun
  • Remark or comment on something you noticed
  • Practice of performing actions required by rules

movement

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US / ˈmu:vmənt /

UK / ˈmuvmənt /

A2
  • noun
  • Part of a piece of classical music
  • Group with a shared interest or goal
  • Group sharing the same idea to change society, art
  • Action you do when exercising, e.g. in a gym
  • Part of a piece of music

relativity

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US / ˌreləˈtɪvəti /

UK / ˌrɛləˈtɪvɪti /

C2
  • noun
  • Einstein theory about time, space and position

speed

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US / spi:d /

UK / spid /

A2
  • noun
  • How fast or slow something is or is done
  • verb
  • To move quickly when completing an action
  • To drive a vehicle faster than laws allow

polymath

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US / ˈpɒlimæθ /

UK / ˈpɑ:limæθ /

A1
  • noun
  • Person of great and varied learning

possible

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US / ˈpɒsəbl /

UK / ˈpɑsəbəl /

A1
  • adjecitve
  • Being able or appropriate for a task or purpose
  • Having a chance of happening, or being true

act

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US / ækt /

UK / ækt /

A1
  • noun
  • What someone did; action; behavior
  • A law or rule passed by a government we must obey
  • One of the parts that a stage play is divided into
  • verb
  • To behave in a certain way
  • To perform on a stage or in a movie

bit

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US / bɪt /

UK / bɪt /

A1
  • noun
  • Device put in a horse's mouth to control it
  • Small piece of something
  • verb
  • (E.g. of fish) to take bait and be caught

custom

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US / ˈkʌstəm /

UK / ˈkʌstəm /

A2
  • adjecitve
  • Specially made to order
  • noun
  • Tradition that most people in a community do

cancel

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US / 'kænsl /

UK / ˈkænsəl /

A2
  • verb
  • To end a legal, business, or other agreement
  • To stop a planned event from happening

einstein

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US / ˈaɪn.staɪn /

UK / ˈaɪn.staɪn /

A1
  • noun
  • Albert Einstein, a German-born theoretical physicist

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

general

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US / 'dʒenrəl /

UK / ˈdʒɛnərəl /

A1
  • adjecitve
  • Widespread, normal or usual
  • noun
  • Top ranked officer in the army

nice

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US / naɪs /

UK / naɪs /

A1
  • adjecitve
  • Being attractive or of high quality or value
  • Good or enjoyable
  • Being kind or friendly

moon

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US / mu:n /

UK / mun /

A2
  • noun
  • Round object circling the Earth at night
  • verb
  • To expose your buttocks as a joke

scishow

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US / /

UK / /

A1

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

both

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US / bəuθ /

UK / boθ /

A1
  • determiner
  • Used to refer to two things at the same time
  • pronoun
  • Used to refer to two things at the same time

celsius

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US / ˈselsiəs /

UK / ˈselsiəs /

B1
  • noun
  • Another name for 'centigrade'

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

hold

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US / həʊld /

UK / hold /

A1
  • noun
  • Section of a ship or plane used for storing things
  • Influence or power held over someone
  • Place of support for hands or feet when climbing
  • verb
  • To agree to keep something for someone
  • To have the capacity to support/contain something
  • To control an area and protect it from attack
  • To not allow someone to leave a place
  • To cause an event to happen at a place or time
  • To use hands or arms to carry or keep something
  • To have a specific quality or property
  • To keep an image, belief or feeling in your mind
  • To have or own something
  • To wait before being able to talk on the phone
  • To limit the movement of someone in a sport

result

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US / rɪ'zʌlt /

UK / rɪˈzʌlt /

A2
  • noun
  • Something produced through tests or experiments
  • Final score of a competition, election or game
  • verb
  • To be the outcome of other causes and effects

space

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US / speɪs /

UK / spes /

A1
  • noun
  • Empty area kept for a specific reason, like a car
  • Empty area with nothing in it
  • Area in the sky where the stars are
  • Area between written words on a page
  • verb
  • To make a certain distance or time between

simple

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US / 'sɪmpl /

UK / ˈsɪmpəl /

A1
  • adjecitve
  • Not hard to understand or do; not complex
  • Having only a few parts; not complex
  • Being ordinary or normal
  • Being plain; without a lot added for style

travel

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US / ˈtrævl /

UK / ˈtrævəl /

A1
  • noun
  • Going to other places, esp. distant places
  • verb
  • To go to a place that is far away

subatomic

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US / ˌsʌbəˈtɒmɪk /

UK / ˌsʌbəˈtɑmɪk /

B1
  • adjecitve
  • Concerning constituents of the atom

theory

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US / ˈθiəri /

UK / ˈθiəri, ˈθɪri /

A2
  • noun
  • Ideas or principles that explain facts or events

across

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US / əˈkrɔs /

UK / əˈkrɔs,əˈkrɑs /

A1
  • adverb
  • Distance from one side to another
  • (Go) from one side to the other of something

hitch

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US / hɪtʃ /

UK / hɪtʃ /

B2
  • noun
  • Small problem that makes things more difficult
  • verb
  • To ask for and get (a ride in someone's car)
  • To attach a trailer to a car; tow

may

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US / meɪ /

UK / me /

A1
  • noun
  • 5th month of the year
  • other
  • Used to express a desire
  • Expresses permission, possibility or probability
  • Used to show that a thing could be true

play

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US / pleɪ /

UK / pleɪ /

A1
  • noun
  • Loose, free movement between two objects
  • Single action in a sports game
  • Performance in which people act in a theater
  • verb
  • To act as a character in a movie, or on stage
  • To perform music on an instrument
  • To use a device, e.g. a video game
  • To do something for enjoyment and fun
  • To do or perform a game or sport

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

also

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US / 'ɔ:lsəʊ /

UK / ˈɔlso /

A1
  • adverb
  • In addition; too; in a similar way

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

kind

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US / kaɪnd /

UK / kaɪnd /

A1
  • adjecitve
  • In a caring and helpful manner
  • friendly and considerate
  • noun
  • One type of thing

payment

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US / ˈpeɪmənt /

UK / ˈpemənt /

A2
  • noun
  • Amount of money that is paid for something

year

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US / jə: /

UK / jɪr /

A1
  • noun
  • Unit of time equal to 12 months or 365 or 366 days
  • Used to refer to the age of a person

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

therefore

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US / ˈðeəfɔ:(r) /

UK / ˈðerfɔ:(r) /

A1
  • adverb
  • And so; for that reason

big

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US / bɪɡ /

UK / bɪɡ /

A1
  • adjecitve
  • Popular
  • Serious
  • Large

easily

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US / ˈi:zəli /

UK / ˈizəli /

A1
  • adverb
  • Clearly; without doubt; certainly
  • Without difficulty

little

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US / 'lɪtl /

UK / ˈlɪtl /

A1
  • adjecitve
  • Being short in length of time
  • Not great in size, amount, or degree; small
  • Being very young or younger than others
  • adverb
  • By an amount or degree that is not very much
  • Not often; rarely
  • noun
  • A person's name

material

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US / məˈtɪəriəl /

UK / məˈtɪriəl /

A2
  • adjecitve
  • Relevant; (of evidence) important or significant
  • Belonging to the world of physical things
  • noun
  • Cloth; fabric
  • Supplies or data needed to do a certain thing
  • Substance from which a thing is made of

let

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US / let /

UK / lɛt /

A1
  • verb
  • To allow someone to do something
  • Introducing a suggestion to do something together
  • To rent a house, etc. to others

might

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US / maɪt /

UK / maɪt /

A1
  • other
  • Used to politely request an action
  • Used to express that something could happen
  • Power, strength, force or influence

mismatch

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US / ˈmɪsmætʃ /

UK / mɪsˈmætʃ /

B1
  • noun
  • Not equal in a contest
  • Two objects or people that do not go together
  • verb
  • To not be the same as or as good as
  • (Of two or more things) to not go well together

unfortunately

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US / ʌnˈfɔ:tʃənətli /

UK / ʌnˈfɔːrtʃənətli /

B1
  • adverb
  • In a way that is to be regretted; unluckily

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

buoyant

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US / ˈbɔɪənt /

UK / ˈbu:jənt /

B2
  • adjecitve
  • Capable of floating in a liquid

below

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US / bɪ'ləʊ /

UK / bɪˈlo /

A1
  • preposition
  • In a lower position, place, or level

mediterranean

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US / ˌmedɪtəˈreɪniən /

UK / ˌmɛdɪtəˈreniən, -ˈrenjən /

A1
  • adjecitve
  • Describing the sea between Italy and Africa

order

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US / 'ɔ:də(r) /

UK / ˈɔrdɚ /

A1
  • noun
  • Religious or social group, as of nuns
  • Instructions to others to do what you want
  • State in which things are neat and organized
  • What you ask to buy, e.g. food in restaurant
  • Social or political control of an area
  • verb
  • To put things in a sequence, e.g. a, b, c
  • To give instructions to others to do what you want
  • To ask for something you want to buy, e.g. a meal

magnitude

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US / ˈmægnɪtju:d /

UK / ˈmæɡnɪˌtud, -ˌtjud /

B2
  • noun
  • Number representing force of an earthquake
  • Size or importance
  • Number representing the brightness of a star

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

phenomenon

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US / fə'nɒmɪnən /

UK / fɪˈnɑməˌnɑn, -nən /

B1
  • noun
  • Unusual event, fact that can be studied
  • Interesting or unusual person, group
  • something that exists and can be seen, felt, tasted, etc., especially something unusual or interesti

outside

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US / ˌaʊtˈsaɪd /

UK / aʊtˈsaɪd, ˈaʊtˌsaɪd /

A2
  • adverb
  • Beyond the limits or edges of some place, thing
  • noun
  • Area around or near something, such as a building
  • preposition
  • Beyond the limits or edges of some place, thing

run

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US / rʌn /

UK / rʌn /

A1
  • noun
  • Journey between two places made by ship or car
  • Series of similar things or successes and failures
  • Act of running; exercise of running
  • verb
  • To depart or travel according to a schedule
  • To cause an animal to move in a certain direction
  • (Of an engine) to be operating
  • To start or use a computer program
  • To flow in a certain direction, like a liquid
  • To manage or operate a business
  • To operate or drive something
  • (Of a road) to go from one place to another
  • To move your legs faster than walking

universe

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US / ˈju:nɪvɜ:s /

UK / ˈjunəˌvɚs /

B2
  • noun
  • All of space that contains planets and stars
  • Things surrounding a person, affecting their life

statistical

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US / stə'tɪstɪkl /

UK / stəˈtɪstɪkəl /

B1
  • adjecitve
  • Concerning the math of data

suggest

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US / səˈdʒest /

UK / səɡˈdʒɛst, səˈdʒɛst /

A1
  • verb
  • To mention something that could be done; propose

answer

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US / 'ɑ:nsə(r) /

UK / ˈænsɚ /

A1
  • noun
  • Reply to a question someone asks
  • Solution to a problem or test question
  • verb
  • To reply to a question someone asks
  • To solve a test question or a problem

click

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US / klɪk /

UK / klɪk /

A1
  • noun
  • The sound a computer mouse makes when you press it
  • A short, slight, and sharp sound
  • verb
  • To work well with someone or something
  • To press a computer mouse
  • To make a short, slight, and sharp sound

follow

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US / ˈfɔləu /

UK / ˈfɑlo /

A1
  • verb
  • To come after someone; be guided by someone
  • To support someone, e.g. singer or comedian
  • To be the logical result of something
  • To happen after something else happens
  • To believe a set of values or a moral teacher
  • To understand something happening or being said

giant

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US / 'dʒaɪənt /

UK / ˈdʒaɪənt /

A2
  • adjecitve
  • Very large, or much bigger than other things
  • noun
  • Tall, large, and powerful human-like creatures
  • Very successful, powerful person or organization

less

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US / les /

UK / lɛs /

A1
  • adjecitve
  • Smaller in amount or degree
  • adverb
  • To a smaller degree
  • noun
  • A smaller amount
  • preposition
  • With the subtraction of

predict

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US / prɪ'dɪkt /

UK / prɪˈdɪkt /

A2
  • verb
  • To guess or estimate what will or might happen

solution

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US / səˈlu:ʃn /

UK / səˈluʃən /

A2
  • noun
  • Mix of a liquid and a solid or a gas
  • Way to solve or deal with a problem

candidate

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US / ˈkændɪdət /

UK / ˈkændɪˌdet, -dɪt /

B1
  • noun
  • Politician who is running for public office

deep

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US / di:p /

UK / dip /

A1
  • adjecitve
  • Complex and important
  • Extreme or intense
  • Going far down from the surface
  • Low in pitch, as a sound
  • adverb
  • At a certain distance beneath the surface

half

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US / hɑ:f /

UK / hæf, hɑf /

A1
  • adjecitve
  • Not complete
  • adverb
  • Partly; somewhat
  • noun
  • One of two equal periods of game time in a sport
  • The part you get when one is divided into two;

tweak

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US / twi:k /

UK / twik /

C1
  • noun
  • A small change or adjustment
  • verb
  • To make a small change or adjustment

stand

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US / stænd /

UK / stænd /

A1
  • noun
  • Effort to fight against something
  • Piece of furniture; device to hold or support
  • Place in a stadium where spectators watch
  • Table where things are sold at a fair or market
  • verb
  • To be a candidate in an election
  • To be able to accept someone, something; bear
  • To last for a long time
  • To be upright; not be sitting or lying down
  • To place something in a particular position; place
  • To be (as stated)
  • To still be valid
  • To have an opinion about something

teach

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US / ti:tʃ /

UK / titʃ /

A1
  • verb
  • To help someone learn or do something

able

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US / 'eɪbl /

UK / ˈebəl /

A2
  • adjecitve
  • Skilled; good at something
  • Having the ability to do something

bad

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US / bæd /

UK / bæd /

A1
  • adjecitve
  • Not good; wrong
  • Lacking in good morals; evil
  • No longer fresh; spoiled

edwin

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US / ˈedwəd /

UK / ˈɛdwəd /

A1

inherent

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US / ɪnˈhɪərənt /

UK / ɪnˈhɪrənt /

B1
  • adjecitve
  • Existing as an essential part of

intense

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US / ɪn'tens /

UK / ɪnˈtɛns /

A2
  • adjecitve
  • Very strong, great or extreme in degree

term

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US / tɜ:m /

UK / tɚm /

A1
  • noun
  • Conditions applying to an agreement, contract
  • Length of time something is expected to happen
  • Fixed period of weeks for learning at school
  • The (precise) name given to something
  • verb
  • To call; give a name to

surface

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US / 'sɜ:fɪs /

UK / ˈsɚfəs /

A2
  • adjecitve
  • Of the top layer; not deep or meaningful
  • noun
  • Top layer of the ground or of water
  • Nature or emotions that show, but may not be true
  • Outside or upper layer of something
  • verb
  • To give (road) a top layer
  • To appear after being hidden, unseen, or unknown
  • To come to the top of something; emerge
  • To come to the top level of water, mud, etc.

famous

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US / 'feɪməs /

UK / ˈfeməs /

A1
  • adjecitve
  • Excellent
  • Widely known; recognized by many people

entire

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US / ɪn'taɪə(r) /

UK / ɛnˈtaɪr /

A2
  • adjecitve
  • Complete or full; with no part left out; whole

instantaneously

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US / ˌɪnstən'teɪnɪəslɪ /

UK / ˌɪnstənˈtenɪəslɪ /

B1
  • adverb
  • Without any delay at all

interfere

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US / ˌɪntə'fɪə(r) /

UK / ˌɪntɚˈfɪr /

B1
  • verb
  • To get involved in something not your business

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

quote

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US / kwəʊt /

UK / kwot /

A2
  • noun
  • Written statement of the cost of something
  • The (often wise or famous) words of another person
  • verb
  • To tell someone how much a task will cost
  • To repeat precisely what a person said or wrote

strength

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US / streŋθ /

UK / strɛŋkθ, strɛŋθ, strɛnθ /

A2
  • noun
  • Condition of being strong

one

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US / wʌn /

UK / wʌn /

A1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1

open

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US / 'əʊpən /

UK / ˈopən /

A1
  • adjecitve
  • Available for use; accessible
  • Not being hidden; available for others to see
  • Being available for customers to enter or use
  • Allowing everyone to use or take part in
  • Not secret anymore
  • Not closed or shut
  • Willing to accept new ideas and thoughts
  • noun
  • Name for a tennis or golf competition
  • verb
  • To make accessible or able to be used, e.g. road
  • To start the activities or services of a business
  • To make a space or hole appear in something
  • To move or change so that it is no longer closed
  • To start something, e.g. a new business

power

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US / 'paʊə(r) /

UK / ˈpaʊɚ /

A1
  • noun
  • Legal or official right to perform certain actions
  • Ability to move forcefully and quickly
  • Energy of something (e.g. electricity or fuel)
  • Mathematical way to multiply a number
  • Condition of being in political control
  • Physical force, energy, and strength
  • verb
  • To give energy to something, e.g. by electricity
  • To move something forcefully and quickly

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

before

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US / bɪˈfɔ:(r) /

UK / bɪˈfɔr,-ˈfor /

A1
  • adverb
  • At a time earlier than the present; previously
  • conjunction
  • In advance of something happening
  • preposition
  • In front of someone or something

construction

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US / kən'strʌkʃn /

UK / kənˈstrʌkʃən /

A2
  • noun
  • Act of building something; thing that is built
  • Something that is made using different parts
  • The way words are organized in a sentence
  • The way something is made or structured

cover

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US / 'kʌvə(r) /

UK / ˈkʌvɚ /

A1
  • noun
  • A different version of another song
  • Bed sheets; blankets
  • (Police or military) protection from attack
  • Amount of money to be paid in an insurance claim
  • Thing you put over something to close or hide it
  • Front and back part of a book or magazine
  • Shelter built to protect from the natural elements
  • verb
  • To record a different version of another song
  • To include as part of its area
  • To put something over something to hide it
  • To discuss a subject in a talk or meeting
  • To form a layer over something so it is hidden
  • To have sufficient funds to pay for something
  • To include something within an agreed limit
  • To report news on TV, radio or in a newspaper
  • (Police or military) to protect from attack
  • To travel a certain distance in a given time
  • To wrap something with something, such as a cloth

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

island

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US / ˈaɪlənd /

UK / ˈaɪlənd /

A1
  • noun
  • Area of land that is surrounded by water

plan

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US / plæn /

UK / plæn /

A1
  • noun
  • Drawing of how something should be done or made

revelation

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US / ˌrevəˈleɪʃn /

UK / ˌrɛvəˈleʃən /

C1
  • noun
  • Act of making something known or seen
  • Showing something astonishing or enlightening

without

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US / wɪˈðaʊt /

UK / wɪðˈaʊt, wɪθ- /

A1
  • preposition
  • Not with; not having

accelerate

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US / əkˈseləreɪt /

UK / ækˈsɛləˌret /

B1
  • verb
  • To cause to occur earlier than expected
  • To increase the speed or rate of something

datum

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US / ˈdeɪtəm /

UK / ˈdetəm, ˈdætəm, ˈdɑtəm /

B1
  • noun
  • Item of factual information

his

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US / hɪz /

UK / hɪz /

A1
  • pronoun
  • Something belonging to a male person

discrepancy

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US / dɪs'krepənsɪ /

UK / dɪˈskrɛpənsi /

B1
  • noun
  • Difference between amounts that should be the same

patch

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US / pætʃ /

UK / pætʃ /

B1
  • noun
  • Cover worn over an eye to protect or hide it
  • Piece of ground on vegetation grows
  • Piece of cloth sewn onto garments to repair holes
  • Small spot different from the area around it
  • verb
  • To join or unite, e.g. two phone calls
  • To repair hole by sewing a piece of cloth over it

plate

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US / pleɪt /

UK / plet /

A2
  • noun
  • Flat dish used for eating or serving food
  • Smooth, thin piece of metal applied in a layer
  • Small, flat piece of metal with information on it
  • verb
  • To put a layer of metal on something to protect it

mirror

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US / 'mɪrə(r) /

UK / ˈmɪrɚ /

A2
  • noun
  • Thing with glass surface used to look at yourself
  • An accurate impression or picture of something
  • verb
  • To reflect (an image)
  • To have similar qualities to something else

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

air

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US / eə(r) /

UK / er /

A1
  • noun
  • Mixture of gases around the earth that we breathe
  • A person's manner intended to impress others
  • verb
  • To expose to the outside, to dry or freshen
  • To broadcast a TV or radio show
  • To open a subject to discussion and debate

challenge

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US / 'tʃælɪndʒ /

UK / ˈtʃæləndʒ /

A2
  • noun
  • An activity you wish to try that may be hard to do
  • Act of formally inviting someone to compete
  • A question to determine correctness of something
  • verb
  • To formally invite someone to compete at something
  • To question the correctness of something

decade

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US / ˈdekeɪd /

UK / ˈdɛkˌed, dɛˈked /

B1
  • noun
  • Period of 10 years

history

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US / 'hɪstrɪ /

UK / ˈhɪstəri /

A2
  • noun
  • Established pattern or record
  • Study of past events as an academic subject

hear

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US / hɪə(r) /

UK / hɪr /

A1
  • verb
  • To be aware of sound; to perceive with the ear
  • To be told or find out information or facts
  • To consider or listen to a court case

equip

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US / ɪ'kwɪp /

UK / ɪˈkwɪp /

A2
  • verb
  • To provide with necessary materials or skills

notice

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US / 'nəʊtɪs /

UK / ˈnotɪs /

A1
  • noun
  • Time by when you must leave, e.g. if you are fired
  • Paper with an announcement, e.g. pinned to a board
  • verb
  • To become aware by sight, touch, or hearing

sun

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US / sʌn /

UK / sʌn /

A1
  • noun
  • Light and heat coming from a large star in the sky
  • Hot shining star the Earth moves around
  • verb
  • To lie in the sunshine and enjoy its warmth

accurately

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US / 'ækjərətlɪ /

UK / 'ækjərətlɪ /

A2
  • adverb
  • Exactly and without any mistakes; correctly

center

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US / 'sentə /

UK / ˈsɛntɚ /

A1
  • noun
  • Community place people go health or social reasons
  • Place in the middle of something
  • Person or thing that is attracting attention
  • verb
  • To direct focus toward something

exist

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US / ɪɡ'zɪst /

UK / ɪɡˈzɪst /

A1
  • verb
  • To be present, alive or real

explore

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US / ɪk'splɔ:(r) /

UK / ɪkˈsplɔr /

A2
  • verb
  • To examine something in detail to learn about it
  • To travel to a place to discover more about it

fall

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US / fɔ:l /

UK / fɔl /

A1
  • noun
  • Season after summer and before winter; Autumn
  • A drop in amount; decrease
  • Dropping from a standing position to the ground
  • verb
  • To drop in amount; to decrease
  • To come down from a higher position suddenly
  • To go from standing to the ground, by accident

end

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US / end /

UK / ɛnd /

A1
  • noun
  • The point where a process or activity stops
  • A point that marks the limit of something; finish
  • Goal or desired result
  • The tip, edge or limit of something
  • verb
  • To be the last part of something

mark

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US / mɑ:k /

UK / mɑrk /

A2
  • noun
  • Person's name
  • A dirty spot or line on something
  • Grade or score given for homework
  • Line or symbol made when writing
  • Particular point on a scale of measurement
  • Grade, such as a student receives in school
  • Stain or spot on something
  • Sign or symbol of a quality of feeling
  • Written sign or symbol
  • verb
  • To put a dirty spot or line on something
  • To give a grade for homework
  • To indicate something with a sign or symbol
  • To make or leave a visible sign of (path, etc.)
  • (Animals) to go to the toilet to show your area
  • To write or draw a line on something

relation

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US / rɪˈleɪʃn /

UK / rɪˈleɪʃn /

A2
  • noun
  • Connection between two or more things
  • A member of your family
  • Way in which two or more things are connected

subtle

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US / 'sʌtl /

UK / ˈsʌtl /

B1
  • adjecitve
  • Delicate or slight so it is difficult to perceive
  • Clever or indirect but hides the true purpose

clear

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US / klɪə(r) /

UK / klɪr /

A1
  • adjecitve
  • Empty; without anything in it or on it
  • Being certain and without doubt
  • Being without any streaks, spots, or cracks
  • Easy to understand; well-explained; obvious
  • adverb
  • Completely; entirely; through the whole of
  • Away from; free from
  • verb
  • To recover from or remove a problem
  • To get rid of the entire contents of
  • To give permission for something to happen
  • To make a place or surface empty by removing
  • To prove that someone is not guilty or to blame

hand

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US / hænd /

UK / hænd /

A1
  • noun
  • Cards given to a player in a card game
  • Piece of a clock that points to the time
  • Someone who performs physical tasks or work
  • Body part at the end of a person's arm
  • Help for someone performing a particular action
  • Condition of having power or influence
  • Member of the crew of a ship
  • verb
  • To give something to someone personally

insulator

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US / ˈɪnsjuleɪtə(r) /

UK / ˈɪnsəleɪtə(r) /

B2
  • noun
  • Material with low conductivity

next

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US / nekst /

UK / nɛkst /

A1
  • adverb
  • The one that follows another in time or order
  • At a time or place directly after the present one
  • noun
  • The one that follows after
  • adjecitve
  • Immediately after the previous one
  • First occurrence after the present one

problem

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US / ˈprɒbləm /

UK / ˈprɑbləm /

A1
  • adjecitve
  • Causing trouble
  • noun
  • Something difficult to deal with or causes trouble
  • Question to show understanding of a math concept

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

worldwide

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US / ˈwɜ:ldwaɪd /

UK / ˈwɚldˈwaɪd /

B1
  • adjecitve
  • Spanning or extending throughout the entire world
  • adverb

accord

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US / ə'kɔ:d /

UK / əˈkɔ:rd /

B1
  • noun
  • Agreement or harmony
  • An agreement or treaty between countries
  • verb
  • To be in harmony or agreement; consent
  • To give (someone) the respect due to them

negative

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US / 'neɡətɪv /

UK / ˈnɛɡətɪv /

A2
  • adjecitve
  • Being harmful, unwanted or unhelpful
  • In mathematics, being less than zero
  • Focusing on the bad aspects; pessimistic
  • noun
  • The opposite to a positive electrical charge
  • In grammar, containing words such as 'no' or 'not'
  • Reply to a question or statement that means 'no'
  • Image on camera film used to make a photo

radical

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US / ˈrædɪkl /

UK / ˈrædɪkəl,'rædɪkḷ /

B1
  • adjecitve
  • Very new and different from what is traditional
  • Concerning something's most basic part or form
  • noun
  • Person who believes in extreme political change

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

away

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US / ə'weɪ /

UK / əˈwe /

A1
  • adjecitve
  • Not present
  • adverb
  • Disappear completely
  • Doing something with a lot of energy
  • Not here; far from here; in a different direction
  • To a different area, location

calculate

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US / 'kælkjʊleɪt /

UK / ˈkælkjəˌlet /

B2
  • verb
  • To find an answer using mathematics
  • To make an educated guess about something

dark

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US / dɑ:k /

UK / dɑrk /

A1
  • adjecitve
  • Of a color that is not light
  • Marked by unhappiness or hopelessness
  • Having little or no light; not light in color
  • noun
  • The time of day when the sky is black

float

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US / fləʊt /

UK / floʊt /

B1
  • noun
  • Object designed to stay on the surface of water
  • Decorated truck used in a festival
  • verb
  • To sell the shares of a company publicly
  • To move slowly and easily through air
  • To rest on the surface of water without sinking

fundamental

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US / ˌfʌndəˈmentl /

UK / ˌfʌndəˈmɛntl /

A2
  • adjecitve
  • Forming a necessary part, base, or core
  • noun
  • A basic part of something
  • (Music) the lowest note in a harmony

meter

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US / ˈmi:tə(r) /

UK / ˈmitɚ /

A1
  • noun
  • Unit of length equal to 100 cm or about 39 inches
  • Device for measuring things e.g. gas
  • Device to put money into to rent a parking place
  • Rhythm of a poem
  • verb
  • To measure water, etc. when it has to be paid for

model

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US / ˈmɒdl /

UK / ˈmɑ:dl /

A2
  • adjecitve
  • Being an excellent example of
  • noun
  • Person who wears fashion to show it to the public
  • A small scale copy of a full original
  • verb
  • To wear and display clothes at a fashion show
  • To make a small scale copy of a full original

wavelength

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US / 'weɪvleŋθ /

UK / ˈwevˌlɛŋkθ, -ˌlɛŋθ /

C1
  • noun
  • To have similar feelings
  • The size of a wave

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

activate

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US / ˈæktɪveɪt /

UK / ˈæktəˌvet /

B1
  • verb
  • To cause to happen; cause a chemical reaction
  • To make something start working

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

foam

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US / fəʊm /

UK / foʊm /

B1
  • noun
  • Mix of a liquid and air to form a mass of bubbles
  • verb
  • To mix air and liquid to form a mass of bubbles

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

moment

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US / 'məʊmənt /

UK / 'moʊmənt /

A1
  • noun
  • Very short or brief period of time
  • A particular period in time

strand

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US / strænd /

UK / strænd /

B2
  • noun
  • Long part of a rope, someone's hair, etc.
  • A theme or topic area
  • verb
  • To cause to be stuck or trapped somewhere

often

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US / ˈɔfən /

UK / ˈɔfən,ˈɑfən,ˈɔftən,ˈɑf- /

A1
  • adverb
  • Many times; frequently; on many occasions
  • Subtitles section
  • This SciShow video is supported by Linode.
  • You can get a $100 60-day credit on a new Linode account at linode.com slash SciShow.
  • In the bottom of a Sardinian mine in the middle of the Mediterranean, physicists are building an elaborate experiment to find the weight of absolutely nothing.
  • Now that might sound strange, but they're trying to get to the bottom of what's unofficially called the worst prediction in the history of physics.
  • See, our universe is not only expanding.
  • That expansion is also accelerating.
  • And scientists aren't really sure why.
  • Because right now, theory and observation don't quite match up.
  • And when I say quite, I mean one theory has predicted an expansion that's 10 to the 120th power too intense.
  • So scientists need to weigh the vacuum of space to find out why our universe hasn't ripped itself apart yet.
  • And which, if any, of our theories are to blame for the colossal mismatch.
  • When Einstein first published his equations of general relativity in 1915, he inadvertently predicted that the universe was contracting under the effects of gravity.
  • But at the same time, physicists were pretty sure that it wasn't.
  • Including Einstein himself.
  • So a couple years later, he tweaked his equations by adding a fudge factor to get the result he wanted.
  • It included a constant that, as long as it wasn't equal to zero, balanced everything out and made the cosmos stand still.
  • And because scientists are great at naming things, it became known as the cosmological constant.
  • And this was all well and good until 1929, when Edwin Hubble noticed that galaxies were moving away from us all across the sky.
  • The only reasonable explanation for this was that the universe was expanding like a loaf of bread in the oven.
  • Physicists no longer needed a fudge factor to maintain a static universe, and Einstein famously referred to it as his, quote, biggest blunder.
  • But decades after his death, we learned he wasn't as wrong as he thought he was.
  • In the late 1990s, scientists found that all those galaxies were not only moving away from us, most were doing it faster than they should.
  • The universe wasn't just expanding, but that expansion was accelerating.
  • Physicists called the source of this phenomenon dark energy.
  • And based on how fast distant galaxies were flying away, they calculated that dark energy must make up around 68% of all the stuff in the universe.
  • But despite being so abundant, it's still not clear what dark energy is.
  • And that's where the cosmological constant comes back into our story.
  • And it's also where we get into the baffling physics of nothing.
  • In the equations for general relativity, the cosmological constant is represented by the Greek letter lambda.
  • And it tells us there's an inherent energy to space itself.
  • Each cubic meter of space has the exact same amount of this repulsive energy, and it doesn't dilute as the universe expands.
  • So the more space you have, the more repulsion you have, explaining how, as the universe gets bigger and bigger, the expansion of the universe gets faster and faster.
  • While Einstein didn't know exactly how each bit of seemingly empty space could come equipped with an innate amount of energy, there was a new field of physics that could step in.
  • Yes, that's right, we're going quantum!
  • Quantum mechanics describes the physics of the subatomic, both the particles you're familiar with like protons, electrons, and even massless photons.
  • But it also governs the behavior of so-called virtual particles.
  • Virtual particles may or may not physically exist, depending on the physicist you ask.
  • But at the very least, they exist inside of physics equations so that we can accurately describe our observations.
  • And all types of particles, whether they're quote-unquote real or virtual, abide by the principle of uncertainty.
  • The Heisenberg uncertainty principle tells us that there's a limit to how much we can know about the quantum world.
  • Like you may have heard, that you can never know both exactly where a particle is and precisely where it's going at the exact same time.
  • But the same rule applies to measurements of time and energy, too.
  • The more precisely we pinpoint a moment in time, the less sure we can be about how much energy is present in that moment.
  • So at any given time and place in the universe, there's a statistical possibility that there will be a little bit of energy that could just as easily disappear in the next moment.
  • And this phenomenon has a name.
  • They're known as vacuum fluctuations.
  • And because this energy is carried by virtual particles, these fluctuations are often described as virtual particles instantaneously popping into and out of existence all over the universe.
  • Which means even a vacuum, which is the definition of nothing, isn't exactly empty.
  • It's filled with an astounding number of short-lived virtual particles and the energy they carry, giving rise to what's known as vacuum energy.
  • So we know that there's this thing called dark energy out there that's causing the universe's expansion to speed up over time.
  • We also know that vacuum energy is out there.
  • And if it's the same as the cosmological constant that Einstein imagined, it's capable of causing the universe to expand.
  • So does that mean that dark energy is literally just vacuum energy?
  • That would be the simplest solution, as well as a solution that combines two major paradigms in physics today.
  • General relativity covers the physics of the extremely large, and quantum mechanics covers the extremely small.
  • Unfortunately, there's a pretty big hitch.
  • Because Einstein taught us a few other important things about reality.
  • First, his famous equation E equals mc squared tells us that energy and mass are equivalent.
  • That means that any amount of vacuum energy has an equivalent amount of mass.
  • And second, one of the fundamental tenets of general relativity is that mass distorts the fabric of spacetime.
  • So if vacuum energy really exists, it has to leave a mark on the structure of our universe.
  • Unaccelerated expansion is one such mark, but the amount of acceleration we can actually observe and measure doesn't come anywhere close to what quantum models predict.
  • It falls short by as many as 120 orders of magnitude.
  • That's a 1 followed by 120 zeros.
  • And even in more sophisticated modeling, that number of zeros is only cut in, like, half.
  • This extreme discrepancy was actually a problem first noted back in the 1920s by the physicist Wolfgang Pauli, when the science of vacuum energy was still in its infancy.
  • He calculated that vacuum energy, if it existed, would have already made the universe expand so much that, given the age of the universe, light wouldn't have had enough time to traverse the distance between the Earth and the Moon.
  • From humanity's perspective, we would be stranded in an observable universe without any other stars, without galaxies, without other planets, without the Sun, without the Moon.
  • All those things would still be there, but we wouldn't be able to see them because the light would have to travel so far to get to us.
  • At that time, Pauli's thought experiment wasn't taken too seriously, but once vacuum energy came back into the spotlight as a dark energy candidate, the discrepancy became a big issue.
  • And it's a clear signal that our understanding of the laws of physics isn't quite right in some unknown way.
  • Now, though, scientists are hoping that an upcoming experiment at the bottom of an Italian mine will shed some light.
  • It's called the Archimedes experiment, and to fix the worst prediction in the history of physics, it needs to measure the weight of nothing.
  • Or more accurately, the virtual particles that fill the vacuum of space.
  • Right now, the laws of physics assume that virtual particles interact with gravity in the same way as real matter does, giving them a certain predictable weight.
  • But, like, maybe that's not true.
  • After all, scientists used to assume the universe wasn't expanding, and look what happened there.
  • While it's not possible to trap or directly measure virtual particles, we can see the effects they have on certain objects.
  • The Archimedes experiment is going to try and measure one of these, the Casimir effect.
  • It's super subtle, but here's what happens.
  • If you hang two plates made out of a special material inside a vacuum chamber, the plates can act kind of like mirrors and reflect the virtual particles that randomly appear between them.
  • But we're still investigating a quantum world here, and on quantum scales, particles don't really act like solid little balls.
  • They also act like waves, with peaks and troughs spaced according to how much energy they have.
  • The more energetic the virtual particle, the more bunched up its wave structure, and vice versa.
  • Normally, the virtual particles that spontaneously appear in a vacuum can have pretty much any energy, and therefore, any wavelength.
  • But between the plates, the wave structures will bounce back and forth and interfere with one another.
  • And when the troughs of one wave overlap with the peaks of another, they can cancel each other out, and a canceled-out wave basically means a canceled-out virtual particle.
  • So this interference means there will be fewer virtual particles between the plates than there are outside of them.
  • And that difference pushes the plates inwards, just like a tiny, tiny bit.
  • Demonstrating this effect helped prove the existence of vacuum energy back in 1997.
  • But how can it help us weigh the vacuum?
  • Well, that's where this new experiment gets its name.
  • Because Archimedes, that polymath from ancient Greece, had something to say about weight in relation to the density of particles and how well things float.
  • Have you ever tried holding an inflatable pool toy under the water?
  • Well, like, in order for it to exist in that particular patch of space, it has to displace a volume of water that is equal to its volume.
  • And that volume of water has a weight to it.
  • According to Archimedes' principle of buoyancy, the weight of this displaced water is equal in strength to the buoyant force that's trying to push the toy towards the surface.
  • Since the toy is filled with air, it has way fewer particles packed inside of it, so the buoyant force is greater than the toy's weight, which means it floats.
  • And if you had the right equipment, you could measure how much holding that toy under the higher than you would without it.
  • That's kind of what this Archimedes experiment is going to do with the Casimir effect.
  • Inside the vacuum chamber, the team will hang two disks, each made from a different material, on either side of a balance beam.
  • Then, they're going to swap between warming the disks up and cooling them down by a few degrees Celsius.
  • Because these disks aren't made of the same stuff, the disks won't respond the same way.
  • Only one will switch between being an electrical insulator and a conductor.
  • And while that disk is a conductor, the Casimir effect should activate inside of it.
  • That means there should be fewer virtual particles on that side of the balance beam, and it should tilt upwards by a tiny amount.
  • As the disk switches between being a conductor and an insulator, and the Casimir effect turns on and off, the beam should seesaw back and forth.
  • And that periodic movement is what the Archimedes team will be looking for.
  • That's a lot of shoulds.
  • And if the beam doesn't appear to move at all, it could mean a few different things.
  • For one, the experiment just might not work.
  • The team isn't 100% sure the Casimir effect works on the stuff they made their flip-flopping disk out of.
  • But assuming it does, the experiment might not be sensitive enough.
  • In terms of scale, it's like trying to weigh the DNA inside of a cell, so the slightest amount of jiggling would bury a signal caused by the Casimir effect.
  • That's why Archimedes is going to be housed deep underground inside an abandoned Sardinian mine.
  • The island of Sardinia is, tectonically, one of the quietest places in Europe.
  • But on top of that, molecules and atoms jiggle, and the warmer they are, the more they move, so the whole setup is also going to be cooled to negative 180 degrees Celsius.
  • Hopefully, that will be enough to catch the Casimir effect in action.
  • And then, if the team still can't observe any movement, it might mean that virtual particles don't weigh anything.
  • The Archimedes experiment is still under construction, and it'll be a few years before we can expect to see any results.
  • Certainly, weighing nothing is going to be a big challenge for experimental physics, but the implications of the results could be huge.
  • If virtual particles end up not weighing what we think they should, it means they don't interact with gravity like normal matter does, which, again, is what scientists currently assume is what's happening.
  • And it means that all the virtual particles populating the universe—all the vacuum energy out there—doesn't bend spacetime as much as our laws of physics predict they should.
  • Which is exactly what we would need to happen if all that dark energy out there is just vacuum energy, no more no less.
  • That said, such a revelation would also open up the question of why virtual particles would behave so strangely.
  • And Archimedes definitely won't be able to answer that on its own.
  • On the other hand, the experiment might produce a weight that matches our predictions, leaving the worst prediction in the history of physics solidly intact.
  • General relativity and quantum mechanics will continue to not play nice together, and one or both of these theories might need tweaking.
  • Or scientists could throw something else into the mix.
  • For example, one physicist has suggested that spacetime is actually like a kind of foam with a constantly changing structure, at least on a tiny scale.
  • Whatever ends up being true, it'll be a radical update to our understanding of physics.
  • But hey, it's the entire universe we're trying to explore here.
  • If we need to find the weight of nothing in order to do it, I say go right ahead.
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