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

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

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to that of component B
Partial pressure of component A to the total pressure
Vapour pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A

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