Does pressure/vacuum affect water vapor differently than other gases and hence humidity?
For example, imagine I have a vacuum bell at atmospheric (mean sea level) pressure and the air in it is 50% humidity. If I apply a vacuum to the bell and reduce the pressure to, say, 300mm of Hg (Torr), will the humidity of the air inside the bell change or remain the same?
If it changes, that would seem to suggest that for some reason the water molecules are preferentially being sucked out by the vacuum pump. Why would that be?