Water Vapor Pressure in the Dortmund Data Bank (DDB)

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Saturation Pressure of Vapor Over Liquid Water

Calculation by Hyland/Wexler


Input of Temperatures [K] (Optional)


Paper

Hyland R.W., Wexler A., "Formulations for the thermodynamic properties of the saturated phases of H2O from 173.15 K to 473.15 K",ASHRAE Trans., 89(2A), 500-519, 1983; Equation 17

Equation

Hyland+Wexler Vapor Over Liquid Water.png

Parameters

g-1 = -5.800221e+03
g0 = 1.391499e+00
g1 = -4.864024e-02
g2 = 4.176477e-05
g3 = -1.445209e-08
g4 = 6.545967e+00

Parameter validity:

273.15 K ≤ T ≤ 473.15 K;

Psat is obtained in [Pa]

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