Which demonstrates the collisions of gas molecules A mass of a tank of gas on a balance B movement of dye in a glass of water C pressure on the inside walls of a balloon D smell of a skunk?

C, the pressure on the inside walls of a balloon, demonstrates the collisions of gas molecules. The gas molecules inside the balloon are constantly moving and colliding with each other and the walls of the balloon, creating pressure. This pressure is a direct result of the kinetic energy and frequency of these molecular collisions.