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 partial pressure of A
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 total pressure

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Mass Transfer
Channelling is most severe

At very high liquid flow rate
In towers packed randomly with crushed solids
In towers packed with stacked packing
In dumped packing of regular units

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