For the first time I framed a question on my own when I was recently playing carrom pool with my cousin and a striking thought ran across my mind!
I was thinking if a square frame is fixed rigidly on a frictionless floor and contains $N$ identical TENNIS balls or discs or whatever of mass $m$ within it & if the balls are moving randomly with a constant speed v and colliding with each other and the walls of the frame. Also lets assume they collisions are perfectly elastic. Then I was wondering what would be the average force on any 1 of the vertical sides of the frame!
This thread gives hints on how to calculate the situation for 2D situation, keeping all assumptions of kinetic gas theory same. But, how would one modify kinetic gas for macroscopic particles? (In this case discs)