Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

May increase or decrease ; depends on individual design
Remains same
Increases
Decreases

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Water has a high latent heat of evaporation
They are always equal under all circumstances
Solubility of the components of air in water is very small
Lewis number is close to unity

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