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.
- I sochoric 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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