> I once caught the nose of a very expensive Olympic >slalom kayak on fire by mixing too hot a batch of resin to get the endpour >for the bow to set up quickly. Exothermic reaction I was told. Chemists. The setting reaction of polyester resin with methylethyl-ketone-phosphate catalyst releases heat; put too much MEKP in, or have too large a solid lump, and it gets so hot it splits and smokes... a bit more and up it goes. A reaction which PRODUCES heat is endothermic (internal heat), one which takes heat-energy to induce is exothermic (outside heat). Ask any biologist! The chemists have it wrong. |
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