Arson%20and%20Explosives2

Arson%20and%20Explosives2 - www.sfpe-newengland.org...

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www.sfpe-newengland.org
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National Fire Protection Association, http://www.usfa.fema.gov/inside-usfa/nfdc/nfdc-data.shtm .
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Methane Oxygen Carbon dioxide Water Arson Investigation
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• A chemical reaction that liberates energy is exothermic, and one that absorbs energy is endothermic . Heat of Combustion is the heat energy evolved when a substance is burned in oxygen. Crude Oil 19,650 Btu/gal Diesel fuel 19,550 Btu/lb Gasoline 19,250 Btu/lb Methane 995 Btu/ cu ft Wood 7,500 Btu/lb Coal 11,000 – 14,000 Btu/lb
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…When air is not the sole source of oxygen Oxidizing agent A substance that supplies oxygen to a chemical reaction Explosives are often composed of oxidizers and fuels ie. Black Powder explosive 3C + S + 2KNO 3 3CO 2 + N 2 + K 2 S + heat Sometimes, explosives have their oxygen and fuel components combined within one molecule. i.e., nitroglycerine Carbon Sulfur Carbon dioxide nitrogen Potassium nitrate Potassium sulfide
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Fires can be prevented by suppression of any one of these
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1. A fuel must be present 2. Oxygen must be available in sufficient quantity to combine with the fuel 3. Heat must be applied to initiate the combustion 4. Free radicals and sufficient heat must be generated to sustain the reaction
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indicated in 5 separate areas of room. This was validated by the lab as to the presence of lamp oil corroborating the dying statement of the victim. Used with permission from Bill
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Arson%20and%20Explosives2 - www.sfpe-newengland.org...

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