A real gas is changed slowly from state 1 to state 2. During this process no work is done on or by the gas . This process must be :

Isovolumic

Explanation:

In thermodynamics, the process whereby A real gas is changed slowly from state 1 to state 2 and in this process there's no work done on or by the gas is called Isovolumic process.

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explanation:

we need to know the time interval during which the force acts. impulse of force = momentum change