absolute zero
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The theoretical lowest possible temperature, at which particles have minimal thermal motion, equal to zero kelvin.
Usage notes
It equals about minus 273.15 degrees Celsius, which is why the kelvin scale starts counting from it.
Test yourself
Which word fits the gap? "_____ has never actually been reached in a laboratory, only approached extremely closely."
Answer: absolute zero
In your own words, what does "absolute zero" mean?
The theoretical lowest possible temperature, at which particles have minimal thermal motion, equal to zero kelvin.
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