Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Interface
All of these
Gas phase
Liquid phase

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Can use any type of units

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Mass Transfer
Steam distillation is used to

Increase the efficiency of separation
Avoid thermal decomposition of a component
Reduce the number of plates
Increase the total pressure of distillation

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