Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

Non-ideal in nature
Soluble in the liquid
Insoluble in the liquid
At a fixed temperature

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids flow at fixed rate

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