Now I wonder if the pressure inside is low enough that you could reach the water's triple point If you cool it down to 0,01°C
this post was submitted on 25 Aug 2023
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Yes definitely. The pressure will drop along the vapor pressure curve all the way to the triple point, gently boiling all the way if you remove the heat from the vapor and not directly from the water.
Thank you for the answer. I'm tempted to try it, but I'm guessing this is not something you can easily do at home.
Do it! it is easy to do at home! Just wear some gloves and safety glasses, those jars can easily shatter during the heating process if you use too hot of a heat source. I recommend a glass top electric stove, or put some kind of metal plate between your jar and the burner to help spread out the heat. Once you seal the jar, take it off the heat right away, so it doesn't build pressure. I boiled mine for a few minutes before sealing to try and get some of the devolved gasses out, and lightly set the lid on top to help the steam push out all the air.
Hmm. I wonder if you could make a higher-quality vacuum this way by adding a getter. You'd think it would still be safe-ish with reactive metals because bulk liquid water never needs to be anywhere near the chamber (air will remove heat too, just somewhat slower).