# How are real gases different from ideal gases?

May 27, 2017

Many ways

#### Explanation:

There are a few assumptions made with ideal gases:

• Elastic collision occurs between ideal gas molecules
• Ideal gas molecules do not possess potential energy, i.e. they are not affected by intermolecular forces
• The volume of ideal gas molecules is negligible compared to the volume of the container
• The ideal gas molecules are spherical in shape
• The ideal gas molecules are all identical

Hence, intuitively deducing, real gases differ from ideal gases in the sense that:

• Real gas molecules do inelastic collisions
• Real gas molecules possess potential energy, i.e. they are affected by intermolecular forces
• The volume of real gas molecules is NOT negligible
• The real gas molecules are not spherical in shape
• The real gas molecules are not all identical
May 27, 2017

You can see that we will need to include, for a real gas, in $P V = n R T$ for example, at least a correction factor for the volume to take into account the volume of the molecules and a correction factor for the pressure to take into account the exchanges of energy during impacts.