
#1
May3013, 02:20 PM

P: 21

Is temperature constant in a polytropic thermodynamic process? The equation pv^n=c leads me to believe so. But logic tells me otherwise. Its not isothermal or adiabatic. Did they derive this equation from using log transforms when analyzing gas experiments?




#2
May3013, 02:29 PM

P: 723

A polytropic process does not require the heat transfer to be negligible. The process is following a relationship between equilibrium states. The equation is restricted to a quasistatic process for a simple compressible gas system.
The above is taking from "Thermodynamics" 5th Edition by Wark. Page 664 



#3
May3013, 03:51 PM

P: 21

But how did they come up with the equation pV^n=c?
I can find any derivation for that equation. I'm trying to understand how the equation was formed. 



#4
May3013, 04:37 PM

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PF Gold
P: 4,508

Polytropic equation 


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