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Is there a compound that turns to gas at a certain temperature but if heated more turns back to liquid and if heated more than turn to gas?

Does it exist naturally? Has a such a substance be found? Can such a substance exist? if yes, then why?

Why couldn't at some temperature molecules interact in such a harmony that they actually cling together?

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No. If you take a molecular system in the gas state, and you heat it up (at constant pressure), there is no reason for it to go into a denser, more organized state, such as liquid or solid. As you increase temperature, the interaction energy between molecules becomes smaller compared to thermal energy.

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    $\begingroup$ More a condensed matter physics problem. I could imagine some very strange conditions, maybe involving superfluid helium, adsorbed on something, with magnetic fields... Definitely not something you can make at home. So for ~100% of cases, I agree. $\endgroup$ – ssavec Oct 28 '13 at 12:56
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    $\begingroup$ @ssavec the question asks for an element, hence the simple answer… for other cases, yeah, you could imagine a system frozen where temperature increase would “unlock” some vibration modes/conformations which would in turn alter the molecular interactions… but I think this would have to be extraordinary (i.e. I cannot think of any real example) $\endgroup$ – F'x Oct 28 '13 at 13:06
  • $\begingroup$ no i meant anything.. $\endgroup$ – Muhammad Umer Oct 28 '13 at 17:30

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