Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Mass transfer co-efficient
Thermal diffusivity
Kinematic viscosity
Volumetric diffusivity

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Mass Transfer
When the solvent dissolves very little of solute, then

Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required
Solvent of low freezing point should be used
Solvent of low latent heat of vaporisation should be used

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