Mixing ratio (x) – Vaisala DM500 User Manual
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
/
⋅
=
ws
w
P
P
RH
(4)
Air temperature (ºC)
Dewpoint temperature (ºC)
0
10
20
30
40
50
60
70
80
90
100
100
80
60
40
20
0
-20
-40
160
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.
w
tot
w
P
P
P
x
-
9907
.
621
⋅
=
(5)
where
P
w
=
water vapor pressure (Pa)
P
tot
=
total process pressure (Pa)
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