Crossword Genius

The lowest temperature theoretically attainable (8,4)

Ross

I believe the answer is:

absolute zero

(Other definitions for absolute zero that I've seen before include "Lowest temperature theoretically possible" , "OK?" , "Minus 273 1/4 C approx." , "can't get lower than this" , "Lowest theoretical temperature" .)

I've seen this clue in The Independent.
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