Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Mass transfer co-efficient
Thermal diffusivity
Volumetric diffusivity
Kinematic viscosity

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Mass Transfer
McCabe-Thiele method

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

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