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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.
The heat energy needed to raise the temperature of m kg of a substance of specific heat capacity c by a certain temperature difference is given by the equation: Heat energy = mass x specific heat capacity x temperature change.owever, a rather more useful quantity is the heat energy needed for 1 kg only. The SPECIFIC HEAT CAPACITY of a substance is the heat needed to raise the temperature of 1 kg of the substance by 1K (or by 1oC). Specific heat capacity is given the symbol c. The units for c are J/(kg K) or J/(kg o C).