Dispersion is controlled by diffusion, which is the movement from areas of high to low concentrations, and by mixing, which is the movement of air in the space.
Diffusion is the process in which a substance naturally moves from an area of higher to lower concentration.
Diffusion<>is<>the process in which a substance naturally moves from an area of higher to lower concentration$$$a substance<>naturally moves<>from an area of higher<>to lower concentration<>the process