Pouillet effect

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In physics, the term Pouillet effect refers to an exothermic reaction that takes place when a liquid is added to a powder. It was first observed by Leslie in 1802 when dry sawdust was wetted with water.[1] Claude Pouillet later described this phenomenon in 1822 when it came to be known as the Pouillet effect in France.[2][3]


  1. ^ Leslie, John (1802). "On capillary action". Philosophical Magazine. 1st series. 14: 193–205.  From p. 201: Upon wetting paper or linen with water or oil, and " … applying a delicate thermometer, I perceived a very sensible extrication of heat invariably to take place during such combinations. And this effect was the greater in proportion to the previous dryness of the solid. Thus I have sometimes produced a heat of ten degrees by moistening saw-dust which had been parched before the fire."
  2. ^ Pouillet (1822). "Mémoire sur de nouveaux phénomènes de production de chaleur" [Memoir on new phenomena of heat production]. Annales de Chemie et de Physique. 2nd series (in French). 20: 141–162.  From p. 142: "À l'instant où un liquide mouille un solide, il y a dégagement de chaleur." (At the instant when a liquid wets a solid, there is a release of heat.)
  3. ^ 'Adsorption by powders & porous solids: principles, methodology and applications' Academic Press, 1999.