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)02468
-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
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