Translations:Thermodynamic and Mechanical Study/436/en

For comparison with an ideal thermodynamic cycle, compression and expansion may be idealized as adiabatic transformations; if they are also reversible, they are isentropic. These are reference transformations only. The real machine does not impose zero heat transfer, zero mass transfer, or closed check valves during compression and expansion, and no construction capable of enforcing perfectly adiabatic phases is assumed here.