Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Momentum diffusivity
Peclet number
Thermal diffusivity
Stanton number

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available
Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent

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