(i) Consider the isothermal process of hydrogen. The initial pressure of the process is, the volume is hS, and the final volume is 0.8hS.

Let the final pressure be p, which is obtained by Boyle's law.

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The process of piston A being pushed back to its first equilibrium position from the highest point is an isothermal process. The initial pressure of the process is 1. 1, and the volume is v; The final pressure is, the volume is, then

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From Boyle's law

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(i i) The process of piston A rising from the initial position to the highest point is an isobaric process. The initial volume and temperature of the process are and, respectively, and the final volume is. Let the final temperature be t, which is obtained by Gay-Lussac's law.

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