From time to time, I come across people who don't really get a grasp of the idea of saturated vapor pressure.
Got an extra gauge set that was leaky and i wasn't using fixed up and turned it into a visual aid. It reads accurate enough as a room thermometer even though the fill fluid is incorrect relative to the scale for PC reasons. The scale is graduated for R12, 22, and 502 but filled with HFC-134a.
I don't know how much of value it is in helping understand saturated pressure, but its a working display of direct relationship of pressure and temperature rather than it being some theoretical book talk.
Do you guys think it would be helpful in explaining SC/SH, sat. to some people?
I've also taken apart an automotive TXV to explain how it works to achieve desired SH.