Question

define principal specific heat capacity a gases at constant pressure are at constant volume​

Answer 1

Principal Specific Heat of Gas at Constant Volume:

The quantity of heat required to raise the temperature of a unit mass of gas through 1 K (or 1 °C) when its volume is kept constant, is called its principal specific heat at constant volume. It is denoted by cV. Its S.I. unit is J K-1 kg-1.