Entropy is a thermodynamic property of matter. Sometimes the idea of Entropy is misunderstood. It directly indicates the availability of energy for extraction. Entropy shows the irrecoverable part of energy. In real systems Entropy increases as process proceeds. Greater the difference between Enthalpy of input and Enthalpy of output the more efficient will be the process. This can be illustrated from H-S Diagram. If a process is said to be adiabatic (no heat losses) and no friction losses then we can say it Isentropic.
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