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7 votes

Water getting hotter once frozen?

I'm speculating, but it's possible this is what happened: I looked up the freezing point of seltzer water (aka club soda), and it's $\pu{-10 ^{\circ}C}$. Since you have a temperature sensor in it, I ...
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3 votes

Is helium-4 a liquid at zero temperature and zero pressure?

It could be that the liquid-vapor line does not exactly hit zero pressure at any temperature above absolute zero, the pressure just becomes too small to distinguish on the graph. You might see the ...
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