This model is used to demonstrate various aspects of kinetic theory of gases. It consists of a clear perspex tube 400 mm long x 50 mm outside diameter provided with a freely sliding expanded polystyrene piston and a loose fitting metal cap. The tube is mounted on a wooden box 175 x 175 x 125 mm high containing an agitator piston driven by a motor. Supplied complete with a pack of plastic spheres and four cardboard discs.
