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
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
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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Mass Transfer
Channelling is most severe

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

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