Vaisala DEWCAP DM500 User's Guide Page 132

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User's Guide ______________________________________________________________________
130 _________________________________________________________________ M210205EN-D
in air at that particular temperature. It is defined below as the ratio of
the water vapor pressure P
w
to the saturation water vapor pressure P
ws
.
%100/
=
wsw
PPRH (4)
Air temperature (ºC) Dewpoint temperature (ºC)
0102030405060708090100
100
80
60
40
20
0
-20
-40
1
6
0
140
120
100
80
60
40
20
0
-20
-40
Relative humidity (%RH)
Figure 26 Water Vapor Saturation Curves
Mixing Ratio (x)
Mixing ratio (x) is mass of water vapour per unit mass of dry air with
which it is associated.
wtot
w
PP
P
x
-
9907.621 = (5)
where
P
w
= water vapor pressure (Pa)
P
to
t
= total process pressure (Pa)
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