Combustion Combustion reactions — oxidation reactions that involve oxygen and produce flames Heat of combustion — excess heat energy Exothermic reactions.

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Presentation transcript:

Combustion Combustion reactions — oxidation reactions that involve oxygen and produce flames Heat of combustion — excess heat energy Exothermic reactions — chemical reactions that release heat

The Fire Tetrahedron Four ingredients are required to start a fire and keep it burning Oxygen Fuel Heat Chain reaction

Hydrocarbons Compounds made only of hydrogen and carbon Used for Fuels Examples: natural gas, gasoline, kerosene, lighter fluid Can be used as accelerants

Flash Point & Ignition Temperature

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

Function of a Fire Investigator Investigation must begin quickly, before evidence is lost First Priority: Find the fire’s point of origin Examine possible causes Accidental Arson Classify the fire

Psychology of an Arsonist Sense of power An emotional high No typical arsonist; possible characteristics: 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

Motives for Arson Financial Gain Revenge Excitement Vanity Crime Concealment Vandalism