Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Total pressure throughout the liquid phase is equal to that throughout the vapor phase
Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
All of these

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Mass Transfer
Molecular diffusion is caused by the

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

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