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in reversible expansion, the maximum amount of work is being done by the system because external pressure remains equal to the internal pressure as the gas expands. in irreversible expansion, the external pressure is constant and work is not maximized.
Also, in reversible expansion, the external pressure always matches the internal pressure. If there is any increase in pressure, external and internal energy will match each other. So, reversible reactions are always doing the maximum possible amount of work. In a reversible reaction, the process is completed very quickly, and external and internal pressure do not match each other at all times. This implies that the maximum amount of work possible is not being done.
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