For demonstration of the kinetic theory of gases explaining the molecular motion of the gases, thinning of air with increasing altitude, increase in pressure / volume with temperature etc. Comprises clear perspex cylindrical tube mounted on a plastic enclosure with a rubber diaphragm at its lower end and a loose?fitting metal cap at its upper end. Just underneath the diaphragm, a piston connected to a low voltage DC motor through eccentric cam, is provided for producing oscillatory motion or vibration of the diaphragm. A pair of colour-coded 4mm socket terminals provided for electrical connection. Includes metal spheres 1/8″ and free-sliding cardboard discs for loading at the top
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