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  4. The work done by a gas is maximum when it expands:

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Q. The work done by a gas is maximum when it expands:

Jharkhand CECEJharkhand CECE 2005

Solution:

Work done, $ W=P\Delta V. $
P-V diagram of different processes is shown below:
As work done is the product of pressure and volume changes, so work done is maximum for that process whose curve surrounds maximum area.
As shown, area of isobaric curve is maximum hence work done in isobaric expansion is maximum.

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