Water Saturation Pressure Temperature

Heat Transfer Engineering
Thermodynamics
Engineering Physics

The partial pressure of water vapor in saturated air is called the saturation pressure Psat.

The saturated vapor pressure of water may be approximated by the following relations (in order of increasing accuracy):

where P is the vapor pressure in mm-Hg and T is the temperature in kelvin.

Saturation Pressure

Water (Saturated) - Thermal Properties

Temperature
°C
Conductivity
W/m-°C
Density
kg/m3
Specific Heat
J/kg-°C
Dynamic Viscosity
kg/m-s
0.0
0.566
999.8
4.225 x 103
0.00179
4.44
0.575
999.8
4.208 x 103
0.00155
10.0
0.585
999.2
4.195 x 103
0.00131
15.56
0.595
998.6
4.186 x 103
0.00112
21.11
0.604
997.4
4.179 x 103
980.0x 10-6
26.67
0.614
995.8
4.179 x 103
860.0x 10-6
32.22
0.623
994.9
4.174 x 103
765.0x 10-6
37.78
0.63
993.0
4.174 x 103
682.0x 10-6
43.33
0.637
990.6
4.174 x 103
616.0x 10-6
48.89
0.644
988.8
4.174 x 103
562.0x 10-6
54.44
0.649
985.7
4.179 x 103
513.0x 10-6
60.0
0.654
983.3
4.179 x 103
471.0x 10-6
65.55
0.659
980.3
4.183 x 103
430.0x 10-6
71.11
0.665
977.3
4.186 x 103
401.0x 10-6
76.67
0.668
973.7
4.191 x 103
372.0x 10-6
82.22
0.673
970.2
4.195 x 103
347.0x 10-6
87.78
0.675
966.7
4.199 x 103
327.0x 10-6
93.33
0.678
963.2
4.204 x 103
306.0x 10-6
104.4
0.684
955.1
4.216 x 103
267.0x 10-6
115.6
0.685
946.7
4.229 x 103
244.0x 10-6
126.7
0.685
937.2
4.25 x 103
219.0x 10-6
137.8
0.685
928.1
4.271 x 103
198.0x 10-6
148.9
0.684
918.0
4.296 x 103
186.0x 10-6
176.7
0.677
890.4
4.371 x 103
157.0x 10-6
204.4
0.665
859.4
4.467 x 103
136.0x 10-6
232.2
0.646
825.7
4.585 x 103
120.0x 10-6
260.0
0.616
785.2
4.731 x 103
107.0x 10-6
287.7
-
735.5
5.024 x 103
95.1x 10-6
315.6
-
678.7
5.703 x 103
86.8x 10-6

Saturation pressure of water at various temperatures

Temperature °C

Saturation Pressure Pa

-40
13
-36
20
-32
31
-28
47
-24
70
-20
104
-16
151
-12
218
-8
310
-4
438
0
611
5
872
10
1,228
15
1,705
20
2,339
25
3,169
30
4,246
35
5,628
40
7,384
50
12,349
100
101,330
200
1.55 x 106
300

8.58 x 106

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