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, pK w , 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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