Heat change at constant pressure & volume

Heat change at constant pressure and constant volume

If the change of state is brought about at constant volume, then no mechanical work is done by the system i.e w = 0.

Under such conditions,

dE = q

I.e. the whole of the heat absorbed by a system at constant volume is utilised to increase the internal energy.

If the change is brought about adiabatically so that system is neither in a position to gain nor to lose heat then q = 0.

Under such conditions,

-dE = w


Decrease in internal energy in an abiabatic system is equal to the work done by the system.

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