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I recently read an article which claims that "engine can do more work at negative temperature". The article seemed to have used a lot of jargon and hence a tough read for an amateur physics enthusiast.

Particles seem to behave strangely at "negative" temperatures and this new phenomenon seems promising. What are interesting properties exhibited by particles at negative temperature in simple language?

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closed as too broad by John Rennie, Emilio Pisanty, dmckee Oct 25 '13 at 3:06

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
More on negative temperature: physics.stackexchange.com/search?q=is%3Aq+negative+temperature –  Qmechanic Oct 23 '13 at 20:47
    
I'm very concerned about this question in its current form. "Interesting" seems to call for a opinion and the question for a list, both of which are red flags to my mind. Left to my own devices I will probably close this in a few hours. Well-reasoned contrary opinions are requested from any who want to prevent that. –  dmckee Oct 23 '13 at 21:47
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I'm with dmckee on this. There are lots of easily Googlable articles on negative temperatures. You should spend some time reading around the subject then come back to us with specific questions. –  John Rennie Oct 24 '13 at 8:52
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