Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Bubble cap
Packed
Perforated tray
Wetted wall

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Mass Transfer
Molecular diffusion is caused by the

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

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