Mass Transfer
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

Differential heat of adsorption
Integral heat of adsorption
Heat of normal condensation
Heat of wetting

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

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
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

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