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<p>of the system alone is conserved only in reversible <a href="page.php?w=Adiabatic_process">adiabatic</a> processes.) Nevertheless, the <a href="page.php?w=Carnot_cycle">Carnot cycle</a> demonstrates that the state of the surroundings may change in a reversible process as the system returns to its initial state. Reversible processes define the boundaries of how <a href="page.php?w=mechanical_efficiency">efficient</a> <a href="page.php?w=heat_engines">heat engines</a> can be in thermodynamics and engineering: a reversible process is one where the</p><p>
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