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this concept is similar to the natural convection and forced convection heat transfer.

MOLECULAR DIFFUSION: the driving force for diffusion is concentration gradient

EXAMPLE: If we take a cup of tea and add a sugar cube and wait for diffusion naturally (diffusion cause due to molecular motion from high region concentration to law region concentration)

                        It will take so much time for diffusion

EDDY DIFFUSION: Provide any external force for mass transfer.assume the same example mention above.

                       rate of mass transfer is higher then molecular diffusion.

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It is the transport of individual molecules from a higher concentration to a lower concentration in a stagnant medium or substance by virtue of their thermal energy .

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