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This web page evaporationnn.blogspot.com states the following, "Basic concept of phase equilibria, factors affecting evaporation, evaporators, film evaporator, single effect and multiple effect evaporator." We saw that the webpage said " Theoretically, evaporation means simply vaporization from the surface of the liquid." It also said " Evaporation is an unit operation by which a solvent is evaporated from a solution by boiling the liquor in a suitable vessel and withdrawing the vapor, leaving a concentrated liquid residue. To make a solution more concentrated. Generally extracts are concentrated in this way."