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

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

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Mass Transfer
Molecular diffusion is caused by the

Thermal energy of the molecules
Transfer of molecules from low concentration to high concentration region
Activation energy of the molecules
Potential energy of the molecules

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