Gas kinetics theory model

Specifications

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.
It is composed of a clear cylindrical tube closed at the top through a loose-fitting lid and with a rubber diaphragm at the base; through the connection of the instrument to a low voltage power supply an oscillatory movement is of the diaphragm is produced.
The instrument also includes a set of small metal spheres and a cardboard disk for loading at the top.