Pressure of saturated water vapor
Pressure of saturated water vapor
(OP)
Good evening.
Does anyone know of a table or perferable a formula for the calculation of the vapor pressure of saturated water vapor. This is for a pure water vapor environment with no air.
Thanks
Does anyone know of a table or perferable a formula for the calculation of the vapor pressure of saturated water vapor. This is for a pure water vapor environment with no air.
Thanks





RE: Pressure of saturated water vapor
RE: Pressure of saturated water vapor
log P(sat) = A - [B/(T+C)]
Where A, B, and C are constants, P(sat) is the vapor pressure at a temperature, T.
From Perry's:
A = 8.07131
B = 1730.630
C = 233.426
This is valid from 1 - 100ºC.
P(sat) is in torr, T is in ºC.
Another equation you can use to calculate Vapor pressure (also from Perry's) is as follows:
P(sat) = exp[C1 +(C2/T) + C3*ln(T) + C4*T^(C5)]
where:
C1 = 73.649
C2 = -7258.2
C3 = -7.3037
C4 = 4.1653E-06
C5 = 2
Temperature (T) is in Kelvin and Vapor pressure (P(sat)) is in Pa. This equation is valid from 0ºC to 373.98ºC.
There are also tables in Perry's Chemical Engineers Hanbook if you need them.
Hope this helps!
Jproj