Mass Transfer
Channelling is most severe

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

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

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

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