Here’s a simple explanation:
Ideal gases:
- Molecules don’t attract or repel each other.
- Molecules are point-like, with no volume.
- Follow PV = nRT perfectly.
- Works well at low pressure and high temperature.
Real gases:
- Molecules do attract or repel each other.
- Molecules have actual volume.
- Do not always follow PV = nRT.
- Deviate more at high pressure and low temperature.
In short: Ideal gases are a perfect model; real gases behave like this only under certain conditions.