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Kinetic Theory Demo with ProjectorPurpose:To show a model of kinetic theory.Procedure:Small metal ball are contained in a holder between glass plates. Container is mounted on Pasco mechanical Vibrator. Piston connected to the vibrator is inserted through the bottom of the container. Plastic slide acting like a freely moving piston is inserted through the top of the container. The image is projected onto a screen by a optical apparatus and projector.Vibrator is driven by a function generator and causes the balls to move and simulate the motion of the molecules of a gas. When the amplitude of the motion of the piston is increased the balls move with greater speed and greater mean-free-path. This causes the lid on the top of the container to rise and simulate an increase in temperature. A small plastic disk can be inserted in the container to demonstrate Brownian motion. Different sizes disks are available to show Brownian motion dependence of the particle size. Hints:Function generator should be set to approx 30 Hz. If the balls are not vibrating, check the lock lever on the mechanical vibrator.Comments:If you have a suggestion for the use of this demo which might benefit others, you can enter it below.  |