This is a jar full of only water (liquid and vapor). It boils at any temperature when you apply something cold enough to the top, like ice.
cross-posted from: https://lemmy.sdf.org/post/2697716
I put water in a jar and sealed it while it was boiling, and now it boils at any temperature. Super fun demo to try.
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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).
