# heat capacity

The heat capacity of an object, *C*, is the limit as Δ*T* tends to zero of Δ*Q* over Δ*T*, where Δ*Q* is the amount of heat that must be added to the object (of mass *M*) in order to raise its temperature by Δ*T*.

Heat capacity, also called **thermal capacity**, is the amount of heat needed to raise the temperature of an
object through 1°C, either at constant pressure or at constant volume
and without inducing chemical changes or a change of phase. Numerically
it is equal to the product of the mass of the object and its specific
heat.

Heat capacity is measured in joules per kilogram (SI units) or calories per gram.