Mass Transfer
Extraction of coffee from its seed is done by

Steam distillation
Extractive distillation
Liquid-liquid extraction
Leaching

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

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

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