The specific heat (= specific heat capacity) at constant pressure and constant volume processes, and the ratio of specific heats and individual gas constants - R - for some commonly used "ideal gases", are in the table below (approximate values at 68 o F (20 o C) and 14.7 psia (1 atm)).

Generally, the most notable constant parameter is the volumetric heat capacity (at least for solids) which is around the value of 3 megajoule per cubic meter per kelvin: [1] Note that the especially high molar values, as for paraffin, gasoline, water and ammonia, result from calculating specific heats in terms of moles of molecules.

2013年2月26日 · If dry air is about 1kg/m3 and the water vapour has displaced some of the dry air molecules then the SHC of the humid air (dry air + water vapour) is going to be less than 1.300kJ/kg.K. To convert H2O from liquid to gas (water to water vapour) requires 2.3kJ/g of latent heat which is more energy than is required to raise 1kg of water 1K.

In thermodynamics, the specific heat capacity (symbol c) of a substance is the amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in temperature. It is also referred to as Massic heat capacity or as the Specific heat.

Ratios of specific heat for gases with constant pressure and volume processes. For an ideal gas the internal energy - u - is a function of temperature. A change in internal energy can be expressed as. du =cv dT (1) where. du = change in internal energy (kJ/kg)

Specific heats and gas constants of ideal gases including steam, air, argon and nitrogen are given in the following table. Here R is gas constant and the unit is kJ/kg-K,

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.

2017年11月12日 · The mass of 1 mole of Hydrogen gas is 0.002 kg. Therefore the energy required to increase the temperature of 1 kg of hydrogen by 1 K equals $\frac{3}{2}R$ multiplied by 500. Numerically, this comes out to be 6235.5 Joules. However, the SHC of hydrogen online is more than double this.

Two specific heats are defined for gases, one for constant volume (CV) and one for constant pressure (CP). For a constant volume process with a monoatomic ideal gas the first law of thermodynamics gives: The ratio of the specific heats γ = C P /C V is a factor in adiabatic engine processes and in determining the speed of sound in a gas.

2006年9月7日 · All substances have a specific heat in solid, liquid or gas. Water is just rather ubiquitous. One has to consider not only the atomic/molecular mass, but the structure, e.g. elemental vs molecular/chemical.