Question

Are all gases ideal?

Answer 1

The case of ideal gas is explained below:

1. No, an ideal gas is a theoretical concept, it is a gas that exists in $0\mathrm{K}$ that does not have any inter-particle interactions.
2. All the gases that exist in the universe have intermolecular interactions and do not behave like an ideal gas.
3. However the real gas behave like ideal gas under low pressure and high temperature.

The above points clearly explains the case of ideal gas.