On Wed, Feb 16, 2011 at 6:08 AM, Thomas Reed <[email protected]> wrote:
> > Dear Kevin and all... > > the "underground coal fire " is really a continuation of the coal making > process, and not a fire at all, since there is no way to get oxygen > underground. > Dear All, Burning coal breaths, if it is kept in a container having a loosely fitting lid. One can test it in a tin can with a lid, which has not been sealed on the can. Put a small quantity of burning coal into the can and close the lid. The heat of the burning coal causes the air inside the can to expand, causing a part of the air inside the can to be expelled. The reduced supply of oxygen causes the fire intensity to be lowered, resulting into cooling. The air inside the can contracts, drawing external air into the can. With the supply of fresh oxygen, the fire intensity goes up, driving the air inside the can to be expelled. This process of alternate heating and cooling goes on until all the coal has burned itself out. One can imagine a similar process taking place in an abandoned mine, or in a natural coal seam with a relatively porous stratum covering it. Yours A.D.Karve
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