Polytropic vs Isentropic efficiency

[196710]

hi everyone,
can anyone explain me the essential differense between polytropic and isentropic head/efficiencies. Know it's quite silly question, sorry for that.

 

[25362]

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[196710]

thanks for your reference, as to my understanding the polytropic process is which the gas properties are considered and the isentropic is in which the friction is neglected, am I right?