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Definition of heat capacity. 1) The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius. 2) The amount of energy needed to raise the temperature of a substance by 1Â°C.
Heat Capacities of Gases The heat capacity at constant pressure C P is greater than the heat capacity at constant volume C V, because when heat is added at constant pressure, the substance expands and work. When heat is added to a gas at constant volume, we have Q V = C V 4T = 4U +W = 4U because no work is done. Therefore, dU = C V dT and C V = dU dT.