Mass Transfer
The dimension of diffusivity is same as that of the

Density
Kinematic viscosity
Molal concentration
Velocity head

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Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Separation of sugar from sugar beet by hot water

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