Hold the blower under the basket and blow air up through it. The moving air will agitate the balls, simulating the kinetic behavior of a gas. Watching the colored ball will allow you to follow the motion of a single “molecule.”
By adjusting the speed or distance of the blower, you can simulate heating and cooling a gas. The faster the balls are moving, the hotter the gas.
Listen for the clicking of the balls against the walls of the cage. At lower “temperatures,” the clicking is quieter and occurs at a slower rate.
You may also want to try this using baskets of different volumes. In this way, you can model the ideal gas law by changing temperature, pressure, and volume.