Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

Zero
Hundred
None of these
Both zero and hundred

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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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