Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Partial pressure of component A to the total pressure
Vapour pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to that of component B

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Mass Transfer
McCabe-Thiele method

Uses molal units for material and energy balance
Is more accurate than Ponchan-Savarit method
Uses weight fractions to express liquid and vapour composition
Can use any type of units

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Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Gas plus its accompanying vapour at 1 atm. and room temperature
Vapour laden gas at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature

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