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

Temperature of the liquid phase is equal to that of the vapor phase
Total pressure throughout the liquid phase is equal to that throughout 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
Steam distillation is used to

Avoid thermal decomposition of a component
Reduce the number of plates
Increase the efficiency of separation
Increase the total pressure of distillation

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