Question: An ideal gas is expanded adiabatically from ( P 1 , V 1 ) to ( P 2 , V 2 ) . Then it

An ideal gas is expanded adiabatically from (P1,V1) to (P2,V2). Then it is compressed at constant pressure to (P2,V1). Finally, the pressure is increased to P1 at constant volume V1. Show that the efficiency of the engine is given by
=1-(1-V2V1)(1-P1P2)
An ideal gas is expanded adiabatically from ( P 1

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