Mass Transfer
Dew point of an air-water vapor mixture

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

All of these
Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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