等熵过程
热力学中的等熵过程（isentropic process或isoentropic process）指的是过程中没有发生熵变，熵值保持恒定的过程 可逆绝热过程就是一种等熵过程。等熵过程在温度-熵图（T-S图）中是平行于温度轴的线段。
Isentropic process
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Isentropic process 等熵过程
![T-s (Entropy vs. Temperature) diagram of an isentropic process, which is a vertical line segment.](/Images/godic/202501/21/Isentropic5558.jpg")
![isentrope und isotherme Zustandsänderungim p-V-Diagramm](/Images/godic/202501/21/Isothermal_and_isentropic_process.svg5558.png")
In thermodynamics, an isentropic process is an idealized thermodynamic process that is adiabatic and in which the work transfers of the system are frictionless; there is no transfer of heat or of matter and the process is reversible. Such an idealized process is useful in engineering as a model of and basis of comparison for real processes.
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