Diffusion is a process by which particles enter the zone of high or low concentration. The speed of this movement is a function of particle size, temperature and average viscosity. There is a series of molecules or atoms in the gas, which are in regular rapid motion, in which chance occurs with many collisions between them and with the walls of the vessels.
Gaseous particles do not only move with high kinetic energy, because their small size also allows them to move through small openings; This process is recognized as an effusion. For the appearance of the effusion, the molecules have a diameter greater than that of the hole. The opening hole should be smaller than the free path, as gas can flow back and forth through the hole.
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