In physics and chemical engineering, the term Pouillet effect refers to an exothermic reaction that takes place when a liquid is added to a powder. Strictly speaking, the heat generated is caused by adhesion of the liquid to the surface of the particles rather than by a chemical reaction. It was first observed in 1802 by Leslie, who noted that heat was evolved when dry sawdust was wetted with water. Claude Pouillet later described this phenomenon in 1822, and it subsequently became known as the "Pouillet effect" in France, and then elsewhere.
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