Mass Transfer
Molecular diffusion is caused by the

Potential energy of the molecules
Activation energy of the molecules
Transfer of molecules from low concentration to high concentration region
Thermal energy of the molecules

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive
Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent

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