Figure P21.18 shows PV diagrams for four thermodynamic cycles. In each case, the cycle consists of three or four processes carried out on identical working substances, and each process is isothermal, isobaric, isochoric, or isentropic. The pressures \(P_{\mathrm{H}}\) and \(P_{\mathrm{L}}\) have the same values in all four cycles. For which single cycle is the most work done on the gas?

Data from Figure P21.18

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(a) P (b) P PH (c) P 1 41 PL 23 2 3 V 2 (d) P +V V 1 3. PL V