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surely a chemical reaction creates heat...not cold
Quote from: neilep on 29/07/2010 12:49:03surely a chemical reaction creates heat...not cold Some chemical reactions release heat: exothermic, but others absorb heat : endothermic.
I didn't understand if it's the kind of pack with water and a salt. In this case it wouldn't be a chemical reaction but a physical process: dissolving many salts in water requires heat, so the solution becomes colder. Usually it's used the salt ammonium nitride NH4NO3.Instead, with a real chemical reaction:http://www.youtube.com/watch?v=yTzcoyzPQE0&feature=related http://www.youtube.com/watch?v=5RJLvQXce4A&feature=related
What is a sheepy? I have seen this term used several times in the various forums and, now, feel like it is time to find out just what is meant by the term. Thanks for comments. Joe L. Ogan
Would you care to be a little more explicit? Thanks for comments. Joe L. Ogan