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# Water - Saturation Pressure vs. Temperature

## Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units.

Water tends to evaporate or vaporize by projecting molecules into the space above its surface. If the space is confined the partial pressure exerted by the molecules increases until the rate at which molecules reenter the liquid is equal to the rate at which they leave. The vapour pressure of water is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state . At higher pressures water would condense . At this equilibrium condition the vapor pressure is the saturation pressure .

### Online Water saturation pressure Calculator

The calculator below can be used to calculate the water saturation pressure at given temperatures.
The output pressure is given as kPa, bar, atm, psi (lb/in2) and psf (lb/ft2).

Temperatur must be within the ranges 0-370 °C, 32-700 °F, 273-645 K and 492-1160 °R

Choose the actual unit of temperature:

The saturation pressure of water depends on temperature as shown below:

See Water and Heavy Water for thermodynamic properties at standard condtions.
See also other properties of Water at varying temperature and pressure : Boiling points at high pressure , Boiling points at vacuum pressure , Density and specific weight , Dynamic and kinematic viscosity , Enthalpy and entropy , Heat of vaporization , Ionization Constant, pK w , of normal and heavy water , Melting points at high pressure , Prandtl number , Properties at Gas-Liquid Equilibrium Conditions , Specific gravity , Specific heat (heat capacity) , Specific volume , Thermal conductivity , Thermal diffusivity and Vapour pressure at gas-liquid equilibrium .

Saturation pressure at temperatures given in degree Celcius and pressure given in kiloPascals [kPa], bars, atmospheres [atm] and pounds per square inch [psi]:

Water - Saturation Pressure vs. Temperature
Temperature Water saturation pressure
[°C] [kPa], [100*bar] [atm] [psi]
0.01 0.61165 0.0060 0.088712
2 0.70599 0.0070 0.10240
4 0.81355 0.0080 0.11800
10 1.2282 0.0121 0.17814
14 1.5990 0.0158 0.23192
18 2.0647 0.0204 0.29946
20 2.3393 0.0231 0.33929
25 3.1699 0.0313 0.45976
30 4.2470 0.0419 0.61598
34 5.3251 0.0526 0.77234
40 7.3849 0.0729 1.0711
44 9.1124 0.0899 1.3216
50 12.352 0.122 1.7915
54 15.022 0.148 2.1788
60 19.946 0.197 2.8929
70 31.201 0.308 4.5253
80 47.414 0.468 6.8768
90 70.182 0.693 10.179
96 87.771 0.866 12.730
100 101.42 1.001 14.710
110 143.38 1.42 20.796
120 198.67 1.96 28.815
130 270.28 2.67 39.201
140 361.54 3.57 52.437
150 476.16 4.70 69.061
160 618.23 6.10 89.667
180 1002.8 9.90 145.44
200 1554.9 15.35 225.52
220 2319.6 22.89 336.43
240 3346.9 33.03 485.43
260 4692.3 46.31 680.56
280 6416.6 63.33 930.65
300 8587.9 84.76 1245.6
320 11284 111.4 1636.6
340 14601 144.1 2117.7
360 18666 184.2 2707.3
370 21044 207.7 3052.2

Saturation pressure at temperatures given in degree Fahrenheit and pressure given in pounds per square inch [psi], pounds per square foot [psf], kiloPascals [kPa] and bars:

Water - Saturation Pressure vs. Temperature
Temperature Water saturation pressure
[°F] [psi] [psf] [kPa], [100*bar]
32.02 0.088712 12.775 0.612
34 0.09624 13.858 0.664
39.2 0.11800 16.991 0.814
40 0.12170 17.524 0.839
50 0.17814 25.651 1.228
60 0.25633 36.912 1.767
70 0.36341 52.330 2.506
80 0.50759 73.092 3.500
90 0.69915 100.7 4.821
100 0.95055 136.9 6.554
110 1.2766 183.8 8.802
120 1.6949 244.1 11.686
130 2.2258 320.5 15.347
140 2.8929 416.6 19.946
150 3.7232 536.1 25.671
160 4.7474 683.6 32.732
170 5.9999 864.0 41.368
180 7.5196 1083 51.846
190 9.3495 1346 64.462
200 11.537 1661 79.547
212 14.710 2118 101.42
220 17.203 2477 118.6
240 25.001 3600 172.4
260 35.263 5078 243.1
280 49.286 7097 339.8
300 67.264 9686 463.8
350 134.73 19402 929.0
400 247.01 35570 1703.1
450 422.32 60814 2911.8
500 680.56 98001 4692.3
550 1045.0 150485 7205.3
600 1542.1 222066 10632.6
625 1851.2 266570 12763
650 2207.8 317922 15222
675 2618.7 377092 18055
700 3092.0 445243 21318

### Saturation Vapor Pressure of some other Liquids at 68 oF or 20 oC

Saturation Vapor Pressure of some other Liquids at 68 oF or 20 oC
LiquidSaturation Vapor Pressure
[psi][Pa]
Carbon tetrachloride,CCl 4 1.9 13100
Gasoline 8.0 55200
Mercury 0.000025 0.17
• 1 Pa = 10-6 N/mm2= 10 -5 bar = 0.1020 kp/m2= 1.02x10-4 m H2O = 9.869x10-6 atm = 1.45x10-4 psi (lbf /in2)

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## Citation

• The Engineering ToolBox (2004). Water - Saturation Pressure vs. Temperature. [online] Available at: https://www.engineeringtoolbox.com/water-vapor-saturation-pressure-d_599.html [Accessed Day Month Year].

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7.25.9

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