Question

Why specific heat of water remains same for constant pressure and constant volume?

Answer 1

more amount of energy has to be supplied to a constant pressure process to increase the system's temperature by the same amont,because some of its energy is lost due to expansion work done by system.

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Answer 2

Hence more amount of energy has to be supplied to a constant pressure process to increase the system's temperature by the same amount, because some of this energy is lost due to expansion work done by the system. Hence the specific heat at constant pressure always exceeds the specific heat at constant volume.