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//(14.10) A closed system at a temperature of 20C and a pressure of 1 bar consists of a pure liquid water phase in equilibrium with a vapor phase composed of water vapor and dry air. Determine the departure, in percent, of the partial pressure of the water vapor from the saturation pressure of water at 20C.
//solution
//With data from Table A-2 at 20C,
vf = 1.0018e-3 //in m^3/kg
psat = .0239 //in bar
p = 1 //in bar
T = 293.15 //in kelvin
Rbar = 8.314 //universal gas constant in SI units
M = 18.02 //molat mass of water in kg/kmol
pvbypsat = %e^(vf*(p-psat)*10^5/[(1000*Rbar/M)*T])
percent = (pvbypsat-1)*100
printf('the departure, in percent, of the partial pressure of the water vapor from the saturation pressure of water at 20 is: %f',percent)
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