Random chemistry cannot be quantified. To attempt an analysis that means something in terms of when it will start, how it will proceed, and what conditions must be present is possible, but the truth is it happens across a variety of materials and circumstances. Oxidation is interesting in that it can be a very slow process like rusting of iron, or it can be near instantaneous, like TNT. When heat is applied the process moves faster. Heat is generated by the process (exothermic reaction) if the heat is unable to escape fast enough to stabilize the temperature, the process rapidly enters a runaway reaction that often starts visible flame and consumes other combustibles near or in contact. I have seen steaming heaps of steel swarf (chips and curls from mill work, usually with oil on them) that were rusting radically. I have seen wet soybean bales in the interior of an open stack that were nothing but ash when uncovered. Cotton is mostly cellulose, Nitrogen, carbon, and oxygen in combinations are easily ignited (gun cotton is cellulose nitrate). Flash point is the temperature that flame based decomposition happens. The variety of materials on and in a rag pile are too complex to formulate a response that has meaning. Jim
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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