Question

Why is the value of Cp greater than that of Cv?
#Thermodynamics

Answer 1

Heat capacity is the heat required to raise the temperature of the system by one degree. Unit of heat capacity is J/K in SI unit system.

When heat capacity is expressed on a unit mass basis, then it is called specific heat. The unit of specific heat is J/kg.K

Cp = heat capacity at constant pressure

Cv = heat capacity at constant volume

Constant volume indicates that there is no change in volume. Therefore the only change in the system is internal energy of the system, due to the addition of heat.

Constant pressure heat capacity is where some amount of heat is also required for the expansion process (change in volume).

Answer 2

Heat capacity is the heat required to raise the temperature of the system by one degree. Unit of heat capacity is J/K in SI unit system.

When heat capacity is expressed on a unit mass basis, then it is called specific heat. The unit of specific heat is J/kg.K

Cp = heat capacity at constant pressure

Cv = heat capacity at constant volume

Constant volume indicates that there is no change in volume. Therefore the only change in the system is internal energy of the system, due to the addition of heat.

Constant pressure heat capacity is where some amount of heat is also required for the expansion process (change in volume).