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Can the internal energy of system be com...

Can the internal energy of system be completely converted into work ? Give examples in support to your answer.

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Yes. In the case of adiabatic process. `dQ=0` so that work is done either by the system or on the system at the expense of internal energy.
`dU=-dW`
Adiabatic expansion results in cooling and adiabatic cotraction in heating.
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