• Eufalconimorph@discuss.tchncs.de
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    1 year ago

    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.

    • Zaphod@discuss.tchncs.de
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      1 year ago

      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