In a reversible process, heat absorbed by the system is equal to that lost from the surroundings. = 5.27 cal/deg Entropy change of the universe For example, one mole ice changes into liquid water at 0 ☌ and 1 atmosphere pressure. When heat change occurs at a constant temperature. = 1.18 cal/deg Entropy change at a constant temperature When one mole of water is heated reversibly from 27 ☌ to 37 ☌. How to calculate entropy change in thermodynamics? It means entropy remains constant for isolated systems or adiabatic processes.
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