Question

An ideal gas goes through a polytropic process. Find the polytropic exponent n if in this process the coefficient

(a) of diffusion; 

(b) of viscosity; 

(c) of heat conductivity remains constant.

Answer 1

Thus D remains constant in the process pV³ = constant So polytropic index n = 3

So η remains constant in the isothermal process 

pV = constant, n = 1, here 

(c) Heat conductivity k = ηC_v and C_v is a constant for the ideal gas 

Thus n = 1 here also,