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

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

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Is the optimum reflux ratio
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is computed from the intercept of the operating line
Cannot be computed

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