Application of the Hygrometer (900-901D1)
A-17
4/9/98
Table A-1: Vapor Pressure of Water
Note:
If the dew/frost point is known, the table will
yield the partial water vapor pressure (P
W
) in
mm of Hg. If the ambient or actual gas
temperature is known, the table will yield the
saturated water vapor pressure (P
S
) in mm of Hg.
Water Vapor Pressure Over Ice
Temp. (°C)
0
2
4
6
8
-90
0.000070
0.000048
0.000033
0.000022
0.000015
-80
0.000400
0.000290
0.000200
0.000140
0.000010
-70
0.001940
0.001430
0.001050
0.000770
0.000560
-60
0.008080
0.006140
0.004640
0.003490
0.002610
-50
0.029550
0.023000
0.017800
0.013800
0.010600
-40
0.096600
0.076800
0.060900
0.048100
0.037800
-30
0.285900
0.231800
0.187300
0.150700
0.120900
Temp. (°C)
0.0
0.2
0.4
0.6
0.8
-29
0.317
0.311
0.304
0.298
0.292
-28
0.351
0.344
0.337
0.330
0.324
-27
0.389
0.381
0.374
0.366
0.359
-26
0.430
0.422
0.414
0.405
0.397
-25
0.476
0.467
0.457
0.448
0.439
-24
0.526
0.515
0.505
0.495
0.486
-23
0.580
0.569
0.558
0.547
0.536
-22
0.640
0.627
0.615
0.603
0.592
-21
0.705
0.691
0.678
0.665
0.652
