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its always an achievement to get colder than previously but why isnt there another unit to measure the approach to absolute zero?

its always an achievement to get colder than previously but why isnt there another unit to measure the approach to absolute zero?

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[–] 0 pt

Any motion, no matter how small, generates heat.

This is an oversimplification. We perceive the motion of molecules as heat. So absolute zero would mean a bunch of molecules with no motion, which is exactly 0 momentum. This would violate the uncertainty principle.

Exactly, which is why absolute zero is unattainable.

[–] 0 pt

Theoretically unattainable, but most of our information at that level is theoretical, so who knows.