Mass Transfer
Dew point of an air-water vapor mixture

Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
All of the listed here
At constant humidity & total pressure is fixed
Decreases with decrease in pressure

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

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

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