Mass Transfer
The cooling effect in a cooling tower can be speeded up by

Increasing the air velocity and area of exposed wet surface
Reducing the humidity of the air
All of the listed here
Reducing the barometric pressure

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available
One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high

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