Inter particles forces in ideal gas is zero. Why?

Distinguish the van der Waals equation from the Ideal Gas Law. Key Points The van der Waals equation is an equation of state that corrects for two properties of real gases: the excluded volume of gas particles and attractive forces between gas molecules. read more

Internal Energy for Ideal Gas is a function of temperature only and is the average K.E., But the potential energy is associated with intermolecular forces and is presumed to be zero in an ideal gas where the only molecular interactions are the perfectly elastic collisions between molecules. read more

The whole idea of an ideal gas is a figment of our imaginations. People realized that if there were any sort of inter-particle forces, that the gases would be more difficult to model. So, it was arbitrarily decided to assume zero inter-particle force for the sake of making the system easier to deal with. read more