A cyclic thermodynamic heat engine, which combines adiabatic and isothermal processes and consists of classical ideal gas as working substance, runs most efficiently if it is reversible.
以经典理想气体为工质的卡诺热机循环由两个等温和两个绝热过程构成，热机可逆时，它的效率为最大。
In this paper, the internal energy and heat of the polytropic process, the adiabatic process and the isothermal processes of the varying mass system are discussed.
讨论了变质量系统的多方过程、绝热过程及等温过程的能量关系，并与常质量系统的多方过程、绝热过程及等温过程的性质进行了比较。
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