4. The working gas contracts at a constant temperature to a smaller volume. This increases its pressure. (Points 3 to 4 on the graph)The Piston does work to compress the gas as it moves down. But this is less than that delivered to the piston on cycle 2

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4. The working gas contracts at a constant temperature to a smaller volume. This increases its pressure. (Points 3 to 4 on the graph)The Piston does work to compress the gas as it moves down. But this is less than that delivered to the piston on cycle 2