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SamQuan236 t1_j3mwlrk wrote

Reply to comment by Lazz45 in Is there a chemical that produces heat when compressed? by Wulphram

Anything with a negative jt coefficient will get colder when compressed, eg nitrogen and hydrogen over their relevant temperature ranges.

http://en.wikipedia.org/wiki/Joule-Thomson_coefficient

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Lazz45 t1_j3n5wos wrote

This genuinely never came up in school even once, and I'm a chemical engineer! Very interesting concept, thank you! I'll edit my reply

It appears it would be useful for refrigeration or leak finding when combined with thermal imaging. Microleaks are extremely hard to detect even with leak detectors

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