User's Guide ______________________________________________________________________
88 __________________________________________________________________ M211280EN-A
Saturation Vapor Pressure
The saturation vapor pressure (P
ws
) is the equilibrium water vapor
pressure in a closed chamber containing liquid water. It is a function only
of temperature, and it indicates the maximum amount of water that can
exist in the vapor state.
The water vapor saturation pressure P
ws
is calculated by using two
equations (6 and 7):
3
oi
i
i
TCT
hPa
(6)
where
T
= Temperature in K
C
i
= Coefficients
C
0
= 0.49313580
C
1
= -0.46094296 * 10
-2
C
2
= 0.13746454 * 10
-4
C
3
= -0.12743214 * 10
-7
3
1
4
lnln
i
i
iws
bbP
(7)
where
b
i
= Coefficients
b
-1
= -0.58002206 * 10
4
b
0
= 0.13914993 * 10
1
b
1
= -0.48640239 * 10
-1
b
2
= 0.41764768 * 10
-4
b
3
= -0.14452093 * 10
-7
b
4
= 6.5459673
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