The Carnot
Cycle (cont’d)
Work done by the gas = òPdV, i.e. area under the
process curve 1-2-3.
1
2
3
3
2
1
Work done on gas = òPdV, area under the process curve 3-4-1
subtract
Net
work
1
2
3
4
dV>0 from 1-2-3
òPdV>0
Since dV<0
òPdV<0