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I have a general question about polytropic processes when working with an ideal gas.

A polytropic process is one for which PV

^{[itex]\gamma[/itex]}= constant.

What I am wondering is if we assume that n is constant, does that mean that the temperature does not change for the process?

I see that PV

^{[itex]\gamma[/itex]}= nrT = constant, but for some reason it doesn't seem right that a polytropic process would be equivalent to an isothermal process if the number of moles of the system doesn't change.

A little light on the subject would be great.

Thanks,

-Luna