Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Water - Saturation Pressure vs. Temperature

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/in 2 ) and psf (lb/ft 2 ).

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]:

 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 o F or 20 o C

Saturation Vapor Pressure of some other Liquids at 68 o F or 20 o C
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/mm 2 = 10 -5 bar = 0.1020 kp/m 2 = 1.02x10 -4 m H 2 O = 9.869x10 -6 atm = 1.45x10 -4 psi (lb f /in 2 )

## Related Topics

### • Air Psychrometrics

Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

### • Material Properties

Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.

### • Steam and Condensate

Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.

### • Thermodynamics

Thermodynamics of steam and condensate systems.

### • Water Systems

Hot and cold water service systems - design properties, capacities, sizing and more.

## Related Documents

### Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.

### Air - SCFM versus ACFM and ICFM

Actual air compressor capacity (ACFM) vs. standard air capacity (SCFM) and inlet air capacity (ICFM).

### Evaporation from a Water Surface

Evaporation of water from a water surface - like a swimming pool or an open tank - depends on water temperature, air temperature, air humidity and air velocity above the water surface - online calculator.

### Evaporative Cooling

Evaporative cooling tutorial.

### Gases Solved in Water - Diffusion Coefficients

Diffusion flux [kg/m2s] tells how fast a substanse solved in another substance flows due to concentration gradients. Diffusion constants [m2/s] for several gases in water.

### Heavy Water - Thermophysical Properties

Thermodynamic properties of heavy water (D2O) like density, melting temperature, boiling temperature, latent heat of fusion, latent heat of evaporation, critical temperature and more.

### Ice and Water - Melting Points vs. Pressure

Online calculator, figures and tables with melting points of ice to water at pressures ranging from 0 to 29000 psia (0 to 2000 bara). Temperature given as °C, °F, K and °R.

### Liquids - Densities vs. Pressure and Temperature Change

Densities and specific volume of liquids vs. pressure and temperature change.

### Liquids - Vapor Pressures

Vapor and saturation pressure for some common liquids.

### Moist Air - Degree of Saturation

Humidity ratio of moist air to humidity ratio of saturated moist air.

### Moist Air - Relative Humidity

Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.

### Moist Air - Vapor Pressure

Vapor pressures vs. dry and wet bulb temperatures in moist air.

### Moist Air - Water Vapor and Saturation Pressure

Saturation pressure of water vapor in moist air vs. temperature.

### Removing Heat with Air

Calculating heat removed with air by measuring the wet bulb temperature.

### Water - Boiling Points at Vacuum Pressure

Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.

### Water - Density, Specific Weight and Thermal Expansion Coefficients

Definitions, online calculator and figures and tables with water properties like density, specific weight and thermal expansion coefficient of liquid water at temperatures ranging 0 to 360°C (32 to 680°F).

### Water - Dynamic (Absolute) and Kinematic Viscosity vs. Temperature and Pressure

Free online calculator - figures and tables with viscosity of water at temperatures ranging 0 to 360°C (32 to 675°F) - Imperial and SI Units.

### Water - Enthalpy and Entropy vs. Temperature

Figures and tables showing the enthalpy and entropy of liquid water as function of temperature - SI and Imperial Units.

### Water - Heat of Vaporization vs. Temperature

Online calculator, figures and tables showing heat of vaporization of water, at temperatures from 0 - 370 °C (32 - 700 °F) - SI and Imperial units.

### Water - Ionization Constant, pKw, of Normal and Heavy Water

Ionization constant (= dissociation constant = self-ionization constant = ion product = autoprotolysis constant ) of water and heavy water, given as function of temperature (°C and °F) in figures and tables.

### Water - Properties at Gas-Liquid Equilibrium Conditions

Figures and tables showing how the properties of water changes along the boiling/condensation curve (vapor pressure, density, viscosity, thermal conductivity, specific heat, Prandtl number, thermal diffusivity, entropy and enthalpy).

### Water - Saturation Pressure and Specific Weight vs. Temperature

Vapor pressure and specific weight of water at temperatures ranging 32 to 212 oF - Imperial Units.

### Water - Specific Gravity vs. Temperature

Figures and tables showing specific gravity of liquid water in the range of 32 to 700 °F or 0 to 370°C, using water density at four different temperatures as reference.

### Water - Specific Heat vs. Temperature

Online calculator, figures and tables showing specific heat of liquid water at constant volume or constant pressure at temperatures from 0 to 360 °C (32-700 °F) - SI and Imperial units.

### Water - Thermal Conductivity vs. Temperature

Figures and tables showing thermal conductivity of water (liquid and gas phase) with varying temperature and pressure, SI and Imperial units.

### Water - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables with thermal diffusivity of liquids and gaseous water at varying temperarures and pressures - SI and Imperial units.

### Water vs. Steam - Critical and Triple Points

Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium.

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!