why Cp (Specific molar capacity due to constant pressure) is greter than Cv (Specific molar capacity due to constant volume)?

Question

Tried Googling but failed to understand 🙁

In: 1

Answer 1

In constant volume energy will only be used for internal energy (temperature change) but in constant pressure it will be used for both internal and external (temperature and volume change => piston moving for example).
Some energy is lost due to system expansion directly causing molar capacity to be higher.

Or, from different perspective, to raise temperature in both systems by same amount, you need to add more heat as your system is also expanding when p=const.