Mass Transfer
The recovery of pencillin from the acidified fermentation broth is done by

Evaporation
Distillation
Absorption
Liquid extraction

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

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
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

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