Ideal Gases

Question 1

What is an ideal gas?

Answer 1

A gas with molecules that occupy very little space.

Has particles that move elastically and randomly.

Follows the law PV=nrT

Question 2

What conditions must be furfilled for a gas to be ideal?

Answer 2

The temperature must be greater than the Critical Temperature.

The pressure must be less than the Critical Pressure.

Question 3

What is a Polytropic Process?

Answer 3

A reversible process that follows the following law.

PVⁿ=Constant

where P = Pressure

V = Volume

n = polytropic index that depends on the nature of the process.

Question 4

What are the values of the polytropic index for the following types of processes?

Isobaric

Isothermal

Isochoric

Adiabatic

Answer 4

Isobaric - n =0

Isothermal - n =1

Isochoric - n = Infinity

Adiabatic - n = cp/cv

where cp is the coefficient of pressure

and cv is the coefficient of volume