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Joules expansion
When a definite mass of a gas is expanded such that the external work done by the gas or on the gas is zero, neither the gas absorbs nor rejects any heat, then the expansion of gas is known as Joules expansion.

Joules law (gases)
Internal energy of an ideal gas only depends on its temperature ‘T’ and doesn’t depend on its volume ‘V’ and pressure ‘P’.

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