Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Drying is a mass transfer process consisting of the removal of water moisture or moisture from another solvent, by evaporation from a solid, semi-solid or liquid (hereafter product). To be considered "drying", the final product must be a solid, either as a continuous sheet (e.g., paper), as long pieces (eg. wood), particles (cereal grains, corn flakes) or in powder form (sand, salt, washing powder, milk powder). To achieve this, there must be a source of heat, and a sink of the vapor thus produced. In bioproducts (food, grains, vaccines), and pharmaceuticals, the solvent to be removed is almost invariably water.

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