this post was submitted on 15 Nov 2023
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Negative absolute temperature is a thing. Lasers exhibit negative temperatures when active, i.e. the lasing medium has a negative temperature expressed in Kelvin. Adding more energy doesn't increase its entropy, it just turns into more laser light. Any such system with bounded entropy can have a negative thermodynamic temperature.
I had a suspicion there was going to be a response like this. Never heard of it but sounds very interesting.
I doubt I'll properly understand it without a good YouTube video. I shall embark on a search