Mass Transfer
Dimension of mass diffusivity is the same as that of

Surface tension
Pressure
Kinematic viscosity
Dynamic viscosity

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

Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of these
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

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