The transfer of mass from high concentration to low concentration is called mass transfer. The physical processes that involve molecular and convective transport and includes both fluid flow and separation operations. Examples of mass transfer processes are the evaporation of water; the diffusion of chemical impurities in lakes, rivers, and oceans from natural or artificial sources; mass transfer is also responsible for the separation of components in distillation column. The random motion of molecules causes a net transfer of mass from an area of high concentration to an area of low concentration and these driving forces results in mass transfer from high to low concentration. The amount of mass transfer can be quantified through the calculation and application of mass transfer co-efficients. Mass transfer application in chemical engineering problems requires material balance on components to be performed.
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