Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate

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Mass Transfer
Molecular diffusion is caused by the

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

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