Mass Transfer
Unit of molal diffusivity is

Gm moles/cm² . sec
Gm moles/cm². sec
Cm²/sec gm . mole
Gm moles/cm. sec

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Mass Transfer
McCabe-Thiele method

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

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

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

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