Water Vapor - 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.
- Isobaric specific heat (Cp) is used for substances in a constant pressure (ΔP = 0) system.
- Isochoric specific heat (Cv) is used for substances in a constant-volume, (= isovolumetric or isometric) closed system.
The specific heat - CP and CV - will vary with temperature. When calculating mass and volume flow of a substance in heated or cooled systems with high accuracy - the specific heat (= heat capacity) should be corrected according values in the table below.
Specific heat of Water Vapor - H2O - at temperatures ranging 175 - 6000 K:
| Temperature - T - (K) | Specific Heat - cp - (kJ/(kg K)) |
|---|---|
| 175 | 1.850 |
| 200 | 1.851 |
| 225 | 1.852 |
| 250 | 1.855 |
| 275 | 1.859 |
| 300 | 1.864 |
| 325 | 1.871 |
| 350 | 1.880 |
| 375 | 1.890 |
| 400 | 1.901 |
| 450 | 1.926 |
| 500 | 1.954 |
| 550 | 1.984 |
| 600 | 2.015 |
| 650 | 2.047 |
| 700 | 2.080 |
| 750 | 2.113 |
| 800 | 2.147 |
| 850 | 2.182 |
| 900 | 2.217 |
| 950 | 2.252 |
| 1000 | 2.288 |
| 1050 | 2.323 |
| 1100 | 2.358 |
| 1150 | 2.392 |
| 1200 | 2.425 |
| 1250 | 2.458 |
| 1300 | 2.490 |
| 1350 | 2.521 |
| 1400 | 2.552 |
| 1500 | 2.609 |
| 1600 | 2.662 |
| 1700 | 2.711 |
| 1800 | 2.756 |
| 1900 | 2.798 |
| 2000 | 2.836 |
| 2100 | 2.872 |
| 2200 | 2.904 |
| 2300 | 2.934 |
| 2400 | 2.962 |
| 2500 | 2.987 |
| 2600 | 3.011 |
| 2700 | 3.033 |
| 2800 | 3.053 |
| 2900 | 3.072 |
| 3000 | 3.090 |
| 3500 | 3.163 |
| 4000 | 3.217 |
| 4500 | 3.258 |
| 5000 | 3.292 |
| 5500 | 3.322 |
| 6000 | 3.350 |
The values above apply to undissociated states. At high temperatures above 1500 K dissociation becomes appreciable and pressure is a significant variable.
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, pKw, of normal and heavy water, Melting points at high pressure, Prandtl number, Properties 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 of Air - at Constant Pressure and Varying Temperature, Air - at Constant Temperature and Varying Pressure, Ammonia, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Hydrogen, Methane, Methanol, Nitrogen, Oxygen and Propane.
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• Material Properties
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
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