See Water and Heavy Water - thermodynamic properties.

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

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) The calculator below can be used to calculate the liquid water specific heat at constant volume or constant pressure and given temperatures.

Isobaric specific heat (C p) for water in a constant pressure (ΔP = 0) system.

I sochoric specific heat (C v) for water in a constant-volume, (= isovolumetric or isometric) closed system.

The specific heat is given at varying temperatures (☌ and ☏) and at water saturation pressure (which for practical use, gives the same result as atmospheric pressure at temperatures < 100 ☌ (212☏)). 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. Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.

C vs ce on a calculator