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Water - Saturation Pressure

Online calculator, figures and tables showing water saturation (vapor) pressure at temperatures ranging from 0 to 370 °C and from 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

Temperature

Choose the actual unit of temperature:

°C °F K °R

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 weightDynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pKw, of normal and heavy water, Melting points at high pressure, Prandtl numberProperties 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]:

 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:

 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 20oC

LiquidSaturation Vapor Pressure
[psi][Pa]
Carbon tetrachloride,CCl4 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)

Related Topics

• Air Psychrometrics - The study of moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content
• Steam Thermodynamics - Thermodynamics of steam and condensate applications
• Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more
• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more
• Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more

Tag Search

• en: water vapor pressure saturation temperature
• es: vapor de agua de saturación de la presión de la temperatura
• de: Wasserdampfdruck Sättigungstemperatur

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