http://en.wikipedia.org/wiki/Fire
Fire is a rapid, self-sustaining oxidation process of combustible gases ejected from a fuel. It starts by subjecting the fuel to heat or another energy source, e.g. a match or lighter, and is sustained by the further release of heat energy.
http://www.nsf.gov/nstw_questions/chem/quest001.htm
What is fire made of?
Fire is heat and light resulting from the rapid combination of oxygen, or in some cases gaseous chlorine with other materials. The light is in the form of flame, which is composed of glowing particles of the burning material and certain gaseous products that are luminous at the temperature of the burning material. The conditions necessary for the existence of fire are the presence of a combustible substance, a temperature high enough to cause combustion (called the ignition temperature) and the presence of enough oxygen (usually provided by the air) or
chlorine to enable rapid combustion to continue. Fire has been produced by two principal methods, friction and percussion. In the friction method, friction raises the temperature of a combustible material (kindling) to ignition temperature. The percussion method produces a
spark to set kindling afire. Fire may also be produced by using a lens or curved reflector to concentrate the rays of the sun on combustible material. (Microsoft Encarta)
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