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

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

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly

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