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The equilibrium conditions of a system consisting of a box with gas dividedby a piston are revised. The apparent indetermination of the problem is solvedby explicitly imposing the constancy of the internal energy when the EntropyMaximum Principle is applied. The equality of the pressures is naturallyconcluded from this principle when the piston is allowed to spontaneously move.The application of the Energy Minimum Principle is also revised.

The thermodynamic equilibrium of gas in a box divided by a piston