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My son points out that some solids can not be melted (because they combust, for example). He wonders if there are any liquids that can not be frozen, or gases that can not be liquified.

Buck Thorn
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Michael Stern
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    Related: https://chemistry.stackexchange.com/questions/29729/why-cant-helium-be-solidified-at-ordinary-pressures. – Oscar Lanzi Jul 01 '19 at 00:33
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    Some liquids separate on freezing. For example, Sn/Pb solder, other than the eutectic alloy, form separate phases of tin-in-eutectic or lead-in-eutectic on cooling. Thus, on freezing, the alloy changes from a fully-dispersed soluton to separate components. See http://www.uefap.com/reading/exercise/ess3/alex2.htm – DrMoishe Pippik Jul 01 '19 at 04:36
  • Related: https://chemistry.stackexchange.com/questions/37413/sublimation-of-iodine/37416#37416 – Ivan Neretin Jul 01 '19 at 05:18
  • All gases can be compressed into a condensed phase, assuming no chemical reaction occurs, but it might be interesting to point out that for Helium (to my knowledge uniquely) just reducing the temperature is not sufficient, pressure is required as well - https://en.wikipedia.org/wiki/Liquid_helium – Ian Bush Jul 01 '19 at 08:31

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