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

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

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

4. Flash Point & Ignition Temperature

5. 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

6. 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

7. 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

8. Motives for Arson Financial Gain Revenge Excitement Vanity
Crime Concealment
Vandalism