Hi everybody, hope someone can help me with this problem.
I'm a chemical engineer and I feel a bit ashamed to present you the following problem. It is about the saturated water vapor pressure of water. We all know it is dependant on ambient conditions like temperature, and described by the Antoine relation. My question is what happens with the saturated water vapor pressure (or % RH) of water when you decrease the ambient pressure?
Example: we have a closed system (say a piston of 1 m3) at 1 bar, 20C and 50% RH. Now, what happens with the % RH when you expand the volume of this piston from 1m3 to 2m3, thus decreasing the pressure to 0.5bar? The use of piston makes sure it a closed system maintained.
I tried Perry's chemical engineer's handbook with little succes. Can someone provide a formule for this one, or some other kind of relation describing the mentioned parameters? Thanks in advance
Regards, Jellis