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# Water - Specific Heat vs. Temperature

Specific heat (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 should be corrected according the figures and tables below.

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

• I sochoric specific heat  (C v ) for water in a constant-volume , (= isovolumetric or isometric ) closed system.
• Isobaric specific heat (C p ) for water in a constant pressure (ΔP = 0) system.

### Online Water Specific Heat Calculator

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

Choose the actual unit of temperature:

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

For full table with Isobaric Specific Heat - rotate the screen!

 Temperature Isochoric Specific Heat (C v ) Isobaric Specific Heat (C p ) [°C] [J/(mol K)] [kJ/(kg K)] [kWh/(kg K)] [kcal/(kg K)] [Btu(IT)/lb m °F] [J/(mol K)] [kJ/(kg K)] [kWh/(kg K)] [kcal/(kg K)] [Btu(IT)/lb m °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:

For full table with Isobaric Specific Heat - rotate the screen!

 Temperature Isochoric Specific Heat (C v ) Isobaric Specific Heat (C p ) [°F] [Btu(IT)/(mol °R)] [Btu(IT)/(lb m °F)] [kcal/(kg K)] [kJ/(kg K)] [Btu(IT)/kmol °R] [Btu(IT)/lb m °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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