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Heat Capacity Ratio

The heat capacity ratio, or ratio of specific heats, is the ratio of the heat capacity at constant pressure (\(C_P\)) to heat capacity at constant volume (\(C_V\)). For an ideal gas, the heat capacity is constant with temperature (\(\theta\)). Accordingly we can express the enthalpy as \(H = C_P*\theta\) and the internal energy as \(U = C_V \cdot \theta\). Thus, it can also be said that the heat capacity ratio is the ratio between enthalpy and internal energy.

http://dbpedia.org/resource/Heat_capacity_ratio

http://en.wikipedia.org/wiki/Heat_capacity_ratio

http://www.iso.org/iso/catalogue_detail?csnumber=31890