Mass Transfer
Design calculation for multiple component distillation is done by

Tray to tray calculations
Mccabe-Thiele method
Enthalpy concentration method
Ponchon-Savarit method

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Mass Transfer
Dew point of an air-water vapor mixture

Decreases with decrease in pressure
All of the listed here
At constant humidity & total pressure is fixed
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

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