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 , Melting points at high pressure , Prandtl number , Properties at Gas-Liquid Equilibrium Conditions , Saturation pressure , Specific gravity , Specific heat (heat capacity) , Specific volume , Thermal conductivity , Thermal diffusivity and Vapour pressure at gas-liquid equilibrium .
Temperature | Ionization constant, pK w | ||
[°C] | [°F] | H 2 O | D 2 O |
0 | 32 | 14.947 | 15.972 |
5 | 41 | 14.734 | 15.743 |
10 | 50 | 14.534 | 15.527 |
15 | 59 | 14.344 | 15.324 |
20 | 68 | 14.165 | 15.132 |
25 | 77 | 13.995 | 14.951 |
30 | 86 | 13.833 | 14.779 |
35 | 95 | 13.680 | 14.616 |
40 | 104 | 13.535 | 14.462 |
45 | 113 | 13.396 | 14.316 |
50 | 122 | 13.265 | 14.176 |
55 | 131 | 13.140 | 14.044 |
60 | 140 | 13.020 | 13.918 |
65 | 149 | 12.907 | 13.798 |
70 | 158 | 12.799 | 13.683 |
75 | 167 | 12.696 | 13.574 |
80 | 176 | 12.598 | 13.470 |
85 | 185 | 12.505 | 13.371 |
90 | 194 | 12.417 | 13.276 |
95 | 203 | 12.332 | 13.186 |
100 | 212 | 12.252 | 13.120 |
150 | 302 | 11.64 | |
200 | 393 | 11.31 | |
250 | 482 | 11.20 | |
300 | 572 | 11.34 | |
350 | 662 | 11.92 |
Temperature | Ionization constant, pK w | ||
[°F] | [°C] | H 2 O | D 2 O |
32 | 0.0 | 14.947 | 15.972 |
40 | 4.4 | 14.758 | 15.768 |
50 | 10.0 | 14.534 | 15.528 |
60 | 15.6 | 14.324 | 15.302 |
70 | 21.1 | 14.126 | 15.090 |
80 | 26.7 | 13.940 | 14.891 |
90 | 32.2 | 13.764 | 14.705 |
100 | 37.8 | 13.598 | 14.529 |
110 | 43.3 | 13.442 | 14.364 |
120 | 48.9 | 13.293 | 14.208 |
130 | 54.4 | 13.153 | 14.060 |
140 | 60.0 | 13.020 | 13.918 |
150 | 65.6 | 12.895 | 13.785 |
160 | 71.1 | 12.776 | 13.658 |
170 | 76.7 | 12.663 | 13.537 |
180 | 82.2 | 12.556 | 13.423 |
190 | 87.8 | 12.455 | 13.317 |
200 | 93.3 | 12.360 | 13.219 |
210 | 98.9 | 12.270 | 13.13 |
212 | 100.0 | 12.252 | 13.12 |
250 | 121.1 | 11.97 | |
300 | 148.9 | 11.65 | |
400 | 204.4 | 11.29 | |
500 | 260.0 | 11.20 | |
600 | 315.6 | 11.49 | |
650 | 343.3 | 11.84 |
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.
Work, heat and energy systems.
Hot and cold water service systems - design properties, capacities, sizing and more.
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.
Thermodynamic properties of heavy water (D2O) like density, melting temperature, boiling temperature, latent heat of fusion, latent heat of evaporation, critical temperature and more.
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.
Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.
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).
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.
Figures and tables showing the enthalpy and entropy of liquid water as function of temperature - SI and Imperial Units.
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).
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.
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.
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.
Online calculator, figures and tables showing Specific Volume of water at temperatures ranging from 0-370 °C and 32 - 700 °F - Imperial and IS Units.
Figures and tables showing thermal conductivity of water (liquid and gas phase) with varying temperature and pressure, SI and Imperial units.
Figures and tables with thermal diffusivity of liquids and gaseous water at varying temperarures and pressures - SI and Imperial units.
Thermal properties of water at different temperatures like density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more.
Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium.
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!
We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.
Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.
Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.
AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.
If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. You can target the Engineering ToolBox by using AdWords Managed Placements.