Mass Transfer
Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.

Dry-bulb
Wet-bulb
Adiabatic saturation
Dew point

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Mass Transfer
To get high tray efficiency

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

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