For demonstration of the kinetic theory of gases and thinning of air as altitude increases. Consists of a clear cylindrical tube with a rubber diaphragm attached to the bottom of the tube and a loose-fitting, metal cap on top. Beneath the diaphragm, a piston connected to a 6 V DC motor is fixed to produce agitation. The whole assembly is mounted on a circular base with two 4-mm socket terminals for electrical connection to the motor. Includes metal balls 1/8”, freely-sliding, expanded polystyrene pistons, and four cardboard discs to load the piston.
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