Mass Transfer
Dew point of an air-water vapor mixture

At constant humidity & total pressure is fixed
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
Decreases with decrease in pressure

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Mass Transfer
When the solvent dissolves very little of solute, then

Large quantity of solvent is required to extract the solute
Solvent of low freezing point should be used
Solvent of low latent heat of vaporisation should be used
Very small quantity of solvent is required

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