Question

In which condition the real gas behaves as an ideal gas?

Answer 1

low pressure and high temperature

Answer 2

A gas behaves ideally if its state can be described by the ideal gas equation:

PV = nRT where P = pressure, V= volume, n = chemical amount, R = ideal gas constant and T = temperature.

The ideal gas equation assumes two things:

• The volume of all the gas molecules is zero.

• There are no attractive forces between the gas molecules.

A real gas will behave as ideal gas when

• temperature is high
• pressure is low

Because at this conditions, the inter molecular spaces will increase between the molecules of gas hence it will have negligible inter molecular forces.