eli5: If absolute 0 is only theoretical, how do we know what it is in Celsius and fereignheit
In: 0
“Only” does not belong in front of “theoretical”.
We know how other temperatures act relative to absolute zero. We cannot get things to it but we can get things very close.
The simplest way to predict it is to get a chamber full of helium. Start it at 20 celsius. Heat it to 100 celsius and see how much it expands.
It expands by about 27%, so we know that 100c is 127% as hot as 20c. So, 20-(100×80/27) is absolute zero.
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