Define heat capacity; molar heat capacity and specific heat capacity of a substance and give relations between them.
Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature.
Molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1 Kelvin. The SI unit of molar heat capacity is the joule, so molar heat capacity is expressed in terms of J/mol·K.
Specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kilogram of a substance by 1 kelvin (SI unit of specific heat capacity J kg−1 K−1).