Question

Polytropic process internal energy formula

Answer 1

A polytropic process is a thermodynamic process that obeys the relation:

pV^n=C

where p is the pressure, V is volume, n is the polytropic index , and C is a constant. The polytropic process equation can describe multiple expansion and compression processes which include heat transfer.

If the ideal gas law applies, a process is polytropic if and only if the ratio (K) of energy transfer as heat to energy transfer as work at each infinitesimal step of the process is kept constant:

K=delta Q\delta W=constant

for gases internal energy, enthalpy depends only on temperature,

since internal energy is a state function does not depend on process