As the movement of the particles of the substance from an area with a high concentration of the substance into the area with a low concentration of the substance. Caused by the particles of the substance, which is kinetic energy is in itself it is not still making particles of different particle sankrathop whose substance anywhere density, it affects most. Make particles of sankrachai in the middle of all directions. Simple diffusion diffusion, the substance from which the substance has more density to the area. The substance has a low density to density of the substance in the same locations. This condition is called the equilibrium of distribution.
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