Question

Why practically isentropic compression used instead of isothermal compression?

Answer 1

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In the isothermal compression of a gas there is work done on the system to decrease the volume and increase the pressure. ... For an adiabatic process, in which no heat flows into or out of the gas because its container is well insulated, Q = 0.

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Answer 2

Polytropic Compressor. Real compression processes operate between adiabatic and isothermal compression. Actual compression processes are polytropic processes. This is because the gas being compressed is not at constant entropy as in the adiabatic process, or at constant temperature as in the isothermal processes