Negative Temperatures?

Put this one in the “You Learn Something New Every Day” category:

negative-temperatureApparently it is possible to have temperatures below absolute zero. John Baez criticizes this New Scientist article (in a g+ post – which I can’t figure out how to link to), but apparently the basic point isn’t completely wrong.

You can have systems with a negative temperature (and when they have a negative temperature they are hotter than when they have a positive temperature (!?)).

There’s a post explaining this on John’s website, so go read that if you want to understand what’s going on.

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