| A sample of ideal gas is taken through steps I, II, and III in a closed cycle, as shown on the pressure P versus volume V diagram above, so that the gas returns to its original state. The steps in the cycle are as follows.
- I. An isothermal expansion occurs from point A to point B, and the volume of the gas doubles.
- II. An isobaric compression occurs from point B to point C, and the gas returns to its original volume.
- III. A constant volume addition of heat occurs from point C to point A and the gas returns to its original pressure.
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