Molecular Diffusion and Brownian Motion

The theory of molecular diffusion has been derived from the theory of Brownian motion, which is the physical phenomenon that small particles immersed in a fluid move randomly. Let us briefly touch on Brownian motion. The theory of Brownian motion was established by Einstein in 

In that year, he published three important papers the theory of Brownian motion an explanation of the photoelectric effect and the special theory of relativity. According to his Brownian motion theory, the fluid molecules move at random by thermal movement, and therefore a small particle would receive a random number of impacts of random strength and from random directions in any short period. If the particle is sufficiently small, this random collision by the fluid molecules would cause 

The theory of molecular diffusion has been developed based on the theory of Brownian motion. Molecular diffusion is defined as the net action of molecules to minimize a concentration gradient. In other words, diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached. This molecular movement is caused by random thermal movement of each molecule. 

Diffusion time increases in proportion to the square of the diffusion path according to  

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Appreciate the thermal basis for molecular diffusion and Brownian motion... 

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