Mass Transfer
In case of unsaturated air

None of the listed here
Wet bulb temperature < dry bulb temperature
Dew point < wet bulb temperature
Both of the options given here

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

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