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Water - Heat Capacity (Specific Heat)

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

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Specific heat capacity (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.

When calculating mass and volume flow in a water heating systems at higher temperature - the specific heat (= heat capacity) should be corrected according the figures and tables below.

The heat capacity is given at varying temperatures (°C and °F) and at water saturation pressure (which for practicle use, gives the same result as atmospheric pressure at temperatures < 100 °C (212°F)).

  • Isochoric heat capacity  (Cv) for water in a constant-volume, (= isovolumetric or isometric) closed system.
  • Isobaric heat capacity  (Cp) for water in a constant pressure (ΔP = 0) system.

Online Water Heat Capacity Calculator

The calculator below can be used to calculate the liquid water heat capacity at constant volum or constant pressure and given temperatures.
The output heat capacity is given as kJ/(kmol*K), kJ/(kg*K), kWh/(kg*K), kcal/(kg K), Btu(IT)/(mol*°R) and Btu(IT)/(lbm*°R)

Note! Temperature must be within the ranges 0-370 °C, 32-700 °F, 273-645 K and 492-1160 °R to get valid values.

Temperature

Choose the actual unit of temperature:

°C  °F  °R 

See Water and Heavy Water - thermodynamic properties.
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, Saturation pressure, Specific gravity, Specific volume, Thermal conductivity, Thermal diffusivity and Vapour pressure at gas-liquid equilibrium,
as well as Specific heat (Heat capacity) of  Air - at Constant Pressure and Varying TemperatureAir - at Constant Temperature and Varying PressureAmmonia, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Hydrogen, Methane, Methanol, Nitrogen, Oxygen and Propane.


heat_capacity_C

heat_capacity_F

Specific heat for liquid water at temperatures from 0 to 360 °C:

Temperature Isochoric Heat Capacity  ( Cv )
Isobaric Heat Capacity  ( Cp )
[°C] [J/(mol K)] [kJ/(kg K)] [kWh/(kg K)] [kcal/(kg K)]
[Btu(IT)/lbm °F]
[J/(mol K)] [kJ/(kg K)] [kWh/(kg K)] [kcal/(kg K)]
[Btu(IT)/lbm °F]
0.01 75.981 4.2174 0.001172 1.0073 76.026 4.2199 0.001172 1.0079
10 75.505 4.1910 0.001164 1.0010 75.586 4.1955 0.001165 1.0021
20 74.893 4.1570 0.001155 0.9929 75.386 4.1844 0.001162 0.9994
25 74.548 4.1379 0.001149 0.9883 75.336 4.1816 0.001162 0.9988
30 74.181 4.1175 0.001144 0.9834 75.309 4.1801 0.001161 0.9984
40 73.392 4.0737 0.001132 0.9730 75.300 4.1796 0.001161 0.9983
50 72.540 4.0264 0.001118 0.9617 75.334 4.1815 0.001162 0.9987
60 71.644 3.9767 0.001105 0.9498 75.399 4.1851 0.001163 0.9996
70 70.716 3.9252 0.001090 0.9375 75.491 4.1902 0.001164 1.0008
80 69.774 3.8729 0.001076 0.9250 75.611 4.1969 0.001166 1.0024
90 68.828 3.8204 0.001061 0.9125 75.763 4.2053 0.001168 1.0044
100 67.888 3.7682 0.001047 0.9000 75.950 4.2157 0.001171 1.0069
110 66.960 3.7167 0.001032 0.8877 76.177 4.2283 0.001175 1.0099
120 66.050 3.6662 0.001018 0.8757 76.451 4.2435 0.001179 1.0135
140 64.306 3.5694 0.000992 0.8525 77.155 4.2826 0.001190 1.0229
160 62.674 3.4788 0.000966 0.8309 78.107 4.3354 0.001204 1.0355
180 61.163 3.3949 0.000943 0.8109 79.360 4.4050 0.001224 1.0521
200 59.775 3.3179 0.000922 0.7925 80.996 4.4958 0.001249 1.0738
220 58.514 3.2479 0.000902 0.7757 83.137 4.6146 0.001282 1.1022
240 57.381 3.1850 0.000885 0.7607 85.971 4.7719 0.001326 1.1397
260 56.392 3.1301 0.000869 0.7476 89.821 4.9856 0.001385 1.1908
280 55.578 3.0849 0.000857 0.7368 95.285 5.2889 0.001469 1.2632
300 55.003 3.0530 0.000848 0.7292 103.60 5.7504 0.001597 1.3735
320 54.819 3.0428 0.000845 0.7268 117.78 6.5373 0.001816 1.5614
340 55.455 3.0781 0.000855 0.7352 147.88 8.2080 0.002280 1.9604
360 59.402 3.2972 0.000916 0.7875 270.31 15.004 0.004168 3.5836


Specific heat for liquid water at temperatures from 32 to 675 °F:

Temperature Isochoric Heat Capasity  ( Cv )
Isobaric Heat Capasity  ( Cp )
[°F] [Btu(IT)/(mol °R)] [Btu(IT)/(lbm °F)]
[kcal/(kg K)]
[kJ/(kg K)] [Btu(IT)/kmol °R] [Btu(IT)/lbm °F]
[kcal/kg K]
[kJ/kg K]
32.2 40.0 1.007 4.217 40.032 1.008 4.220
40 39.9 1.005 4.208 39.916 1.005 4.208
50 39.8 1.001 4.191 39.801 1.002 4.196
60 39.6 0.996 4.169 39.739 1.001 4.189
80 39.2 0.986 4.128 39.660 0.999 4.181
100 38.7 0.975 4.082 39.643 0.998 4.179
120 38.3 0.963 4.033 39.662 0.999 4.181
140 37.7 0.950 3.977 39.702 1.000 4.185
160 37.2 0.937 3.923 39.761 1.001 4.191
180 36.7 0.923 3.865 39.835 1.003 4.199
200 36.1 0.909 3.805 39.927 1.005 4.209
212 35.7 0.900 3.768 39.993 1.007 4.216
220 35.5 0.895 3.745 40.042 1.008 4.221
240 35.0 0.880 3.686 40.186 1.012 4.236
260 34.4 0.867 3.629 40.364 1.016 4.255
280 33.9 0.854 3.574 40.580 1.022 4.278
300 33.4 0.841 3.522 40.838 1.028 4.305
350 32.3 0.813 3.404 41.685 1.050 4.394
400 31.3 0.789 3.302 42.902 1.080 4.522
450 30.4 0.767 3.209 44.009 1.108 4.639
500 29.7 0.748 3.130 47.296 1.191 4.986
550 28.8 0.725 3.035 51.318 1.292 5.410
600 28.3 0.713 2.987 59.690 1.503 6.292
625 28.4 0.716 2.997 66.611 1.677 7.022
650 28.9 0.728 3.047 82.851 2.086 8.734
675 29.9 0.754 3.156 126.670 3.189 13.353

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