combustion combustion reactions — oxidation reactions that involve oxygen and produce flames heat...
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The Fire Tetrahedron Four ingredients are required to start a fire and keep it burning Oxygen Fuel Heat Chain reactionTRANSCRIPT
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Combustion
Combustion reactions — oxidation reactions that involve oxygen and produce flames
Heat of combustion — excess heat energy
Exothermic reactions — chemical reactions that release heat
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The Fire TetrahedronFour ingredients are
required to start a fire and keep it burning Oxygen
Fuel
Heat
Chain reaction 2
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Hydrocarbons
Compounds made only of hydrogen and carbon Used for Fuels Examples: natural gas, gasoline, kerosene, lighter
fluid
Can be used as accelerants
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Flash Point & Ignition Temperature
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Finding the Igniter
Matches — often burns in the fire
Cigarette lighters — often removed by arsonist
Molotov cocktail — may leave glass fragments
Faulty electrical wiring — causes an arc which causes a predictable pattern
Knowing the igniter helps form the criminal profile 5
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Function of a Fire Investigator
Investigation must begin quickly, before evidence is lost
First Priority: Find the fire’s point of origin
Examine possible causesAccidentalArson
Classify the fire6
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Psychology of an Arsonist Sense of power An emotional high No typical arsonist; possible
characteristics:
7
• Less than 25 years old• Father not in the home• Domineering mother• Academically challenged• Emotionally and/or psychologically disabled
• Unmarried• Living with parents• Inadequacy, insecurity• Fascination with fire• Alcoholism• Parental neglect or abuse
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Motives for Arson
Financial Gain Revenge Excitement Vanity Crime Concealment Vandalism