|
At -20, the vapor is saturated. As Bossnass said, you should be able to look up the corresponding Psat for the R134a in a table. After that you can use the idea gas law to get the original pressure. Since the volume and number of moles are constant, they (along with the gas constant) drop out of the equation. It reduces to:
P1/Psat = T1/Tsat (of course make sure you use absolute temp)
Bossnass - Are you an ME? I remember hearing that ME's like to combine the ideal gas constant, R with the molecular weight.
|