On Mon, 9 Sep 1996 17:48:24 -0700, gmiii@in*.co* wrote:

>
>  Discovery Channel, and I was wondering when myself. Three things are needed 
>for combustion: heat, fuel , and rapid compression. 

	Actually there are four necessary elements, the absence of any one of
which will prohibit combustion:  heat, fuel, an oxidizing agent (most
commonly oxygen, however combustion can be created in a Chlorine
atmosphere, for example), and a chemical chain reaction.  This fourth
element makes up the fire tetrahedron, and it is by eliminating this
chain reaction that a Halon fire extinguisher works.

-Sean
 

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