List all the following that are true about the polytropic process Pv^n = constan
ID: 1862473 • Letter: L
Question
List all the following that are true about the polytropic process Pv^n = constant.
Please show your work.
(a) A polytropic process is always isothermal.
(b) A polytropic process is never isothermal.
(c) A polytropic process is sometimes isothermal. answers not shown
(d) Only ideal gases perform polytropic processes.
(e) Only non-ideal gases perform polytropic processes.
(f) The polytropic exponent, n, is a material property (i.e. only one value of n for air)
(g) The polytropic exponent, n, varies with the rate of heat transfer, Q?
Explanation / Answer
Only statement (c) is true. A polytropic process is isothermal when n=1. So (a) and (b) are false.
n=0 --> Isobaric process.
n=1 --> Isothermal process
n = gamma --> adiabatic process
Polytropic processused to accurately characterize processes of certain systems notably the compression or expansion of a gas and in some cases liquids and gases. So (d), (e) are false. The polytropic exponent, n is different for monoatomic, diatomic and triatomic gases. So (f) is false. It does not vary with rate of heat transfer. So (g) is false