Work is only done when the volume of the gas changes.
Therefore, a PV diagram gives a visual interpretation of work done.
Two process are shown that take an ideal gas from state 1 to state 3. Compare the work done by process A to Process A the work done by process B.
a) WA > WB
b) WA < WB
c) WA =WB = 0
d) WA = WB but neither is zero
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