Mass Transfer
Unit of molal diffusivity is

Gm moles/cm. sec
Gm moles/cm². sec
Cm²/sec gm . mole
Gm moles/cm² . sec

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Mass Transfer
To get high tray efficiency

Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large
Time of contact between the two phases should be less
Liquid entrainment should be severe

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