Question

A gas that follows Boyle’s law, Charle’s law and Avogadro’s law is called an ideal gas. Under what conditions a real gas would behave ideally?

Answer 1

Conditions for Ideal gas Behaviour

A real gas behaves ideally under these two conditions:

• Low pressure: At low pressure, system volume increases, and volume of gas molecules becomes negligible as compared to total volume. Hence molecules are considered to occupy no volume relative to the overall volume of system. So, gas seems to behave as an ideal gas.
• High temperature: At high temperature gas molecules movement becomes faster such that there is negligible force of attraction between the molecules of a gas. So, when there is negligible intermolecular force of attraction between molecules, a real gas seems to behave as an ideal gas.

At high temperature and low pressure, the gases behave ideally, since the two postulates of kinetic theory of gases are true under these conditions