Mass Transfer
Separation of two or more components of a liquid solution can not be achieved by

Absorption
Liquid extraction
Fractional crystallisation
Evaporation

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of these
Hot water entering and the cooled water leaving the cooling tower

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