How low can you go?

Classical Mechanics Level 3

What is the lowest possible temperature for any substance?

There is no limit − 324.7 1 ∘ C -324.71^\circ C − 459.6 7 ∘ C -459.67^\circ C − 273.1 5 ∘ C -273.15^\circ C

Alex Li by Alex Li , 22, USA

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1 solution

Alex Li
Jun 29, 2015

In 2013, scientists created a quantum gas whose temperature fell below absolute zero:

http://www.nature.com/news/quantum-gas-goes-below-absolute-zero-1.12146

Ironically, when an object has a temperature below absolute zero, it is "hotter" than any object with a positive temperature, in the sense that heat always transfers from the negative temperature to the positive one, and the object becomes even hotter as the temperature approaches absolute zero from the negative side.

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