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Question

Maximum work by an expansion of a gas in a closed system is possible when process takes place at constant

A.

Pressure

B.

Temperature

C.

Volume

D.

Enthalpy

Answer ( Option A)

Pressure

Solution

In p-V graph, if process is completely isobaric (constant pressure) then work done let W1. If process is completely isothermal (constant temperature) then work done let W2. If process is completely adiabatic (pvr = c ) then work done let W3.


Area under the curve in a p-V diagram is the work done.

Considering the graph shown above, area under the curve (1) is more than (2) and (3).

Therefore, we can conclude that w1 > w2 > w3

Hence, the correct option is (A).

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