Pouillet effect
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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.[1] It was first observed in 1802 by physicist John Leslie, who noted that heat was evolved when dry sawdust was wetted with water.[2] Claude Pouillet later described this phenomenon in 1822, and it subsequently became known as the Pouillet effect in France, and then elsewhere.[3][4]