Heat capacity

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The heat capacity (as distinct from specific heat) is the amount of heat required to increase the temperature of any stated amount of substance (rather than a unit amount) by 1 kelvin. Heat capacity is an extensive property, i.e. its value is proportional to the amount of the substance. For example, a kilogram of water has a greater heat capacity than 100 grams of water. The heat capacity is usually expressed as JK^-1.

Specific heat capacities and heat capacities have the same symbols of $C_p$ and $C_v$ . The specific heat ratio, $k$ , has the same numeric value whether based on specific heats or heat capacities, since the respective amounts of substance cancel out.