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Treebeard's Stumper Answer
6 Sep 96

You blow on a fire to get it going. You also blow on a fire to put it out. How can this be?

You blow on a fire to get it going and also to put it out. Explain. Dean Davidge sent in the first answer, and it's short enough to to quote: "When you blow gently on a fire you add oxygen allowing the fire to burn hotter. But if you blow too hard ... the extra air cools the fuel so that it is below the temperature at which combustion can be sustained, and the fire goes out." Here in a nutshell is the classic fire triangle of oxygen, heat, and fuel.

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Marc Kummel / mkummel@rain.org