Mass Transfer
Weeping in a distillation column

Provides large interfacial surface for mass transfer
Results due to very high gas velocity
Increases tray efficiency
Results due to very low gas velocity

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the total pressure
Vapour pressure of component A to that of component B
Partial pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A

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