The phase diagram of water implies that at a high enough pressure (100 kbar) that very hot 300°C ice can exist. Researching about ice burning someone just nets results on frost bite (which is different here), and I can't seem to find any existence of this phenomena (nor have I seen any picture/experiments discussing it).

The same could be said for applying a bit of extra pressure to 101°C vapor and it should convert to liquid, but I haven't seen any videos producing this either.

Am I interpreting this phase diagram correctly?

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1 Answer 1


Yes. Although putting ice in contact with your skin at 1GPa, the heat is going to be the least of your worries.

Keeping water liquid at 101 degC is easy - that's why you have a pressure cooker.

  • $\begingroup$ 1) My greatest worry is not seeing this happen, my next worry, as you astutely stated, is experiencing it. :) Seems like if there's lots of videos on critical fluids and water at its triple point, you'd see something like this happen just as much. There's likely a reason why it's not happening. 2) True on the pressure cooker. I'd say it seems strange there's so many experiments on YouTube but seeing 101C water vapor get put in a syringe and compressed should result in seeing it shift to a liquid. Seems like an easy experiment. $\endgroup$ Nov 27, 2017 at 0:20
  • $\begingroup$ Some of use need a pressure cooker to get liquid water at 100C (or even 96C or so). $\endgroup$
    – Jon Custer
    Nov 27, 2017 at 15:04
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    $\begingroup$ @JonCuster - hence the British strategic decision to withdraw in 1776. Once it was discovered that you couldn't make a decent cup of tea in Denver there didn't seem much point in keeping the place $\endgroup$ Nov 27, 2017 at 17:16
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    $\begingroup$ @MartinBeckett - now you are just begging for a holy war on the appropriate temperature of water to make a good cup of tea! The Highlands of Scotland may rise in revolt again! $\endgroup$
    – Jon Custer
    Nov 27, 2017 at 17:20

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