arson and explosives

what is arson

criminal act of deliberately setting a fire

why might someone deliberately setting a a fire

insurance fraud, crime concealment, pyromania and revenge

what is the goal for fire investigators to detect

chemical materials, igniters and reconstruct events

what is fire

a product of the process of the process during which oxygen units with a substance to produce heat

once heat is liberated what happens

creates a chain reaction known as thermal feedback

what are the 3 requirements for combustion

fuel, oxygen and heat applied

what do investigators look for when they arrive at scene

look for v pattern of char to find origin of fire

Once investigators locate origin what do they look for

accelerates and ignition

what is a acceleration

substance to spread fire

examples of accelerations

wood, paper, road flars

what are ignition devices

matches, mechanical devices and electrical equipment

what is a flash point

lowest temperature when vapor of a substance ignites

what is auto ignition temperature

minimum temperature at which a substance can ignite spontaneously

what is flashover

occurs when a fire near combustible surface exposed to thermal radiation in enclosed space

what is backdrift

fire is starved of oxygen and flame dies off but gas is hot, causing flame to reignite

what are way to detect acceleration

dogs, pour pattern

when looking for point of origin investigators look from where

least damaged to most damaged

how do investigators document

photos, notes and video

what causes explosions

intense outward expansion of gas, heat, sound and light which burn objects

what is explosives

rapid relapse of chemical and physical energy in a short time

what cause the most damage due to explosives

shock waves

what is shock wave

high compressed air that radiates out of the center of a explosion

what is the center of where the bomb went off called

epiccenter

what is sharpenal

parts of the bomb and things loaded into bomb

what happens to sharpnel when it blows up

flys at high speed leading to breaking buildings and hurting people

what is High explosive

material that burns faster than the speed of sound

what are examples of high explosive

TNT, dino,ite

what is low explosive

slower than the speed of sound

example of low explosive

gunpowder and fireworks

what are nefroius individuals

people who create bombs

what is a pipe bomb

most common explosive, short length of pipe capped at both ends

high and low explosives can be what

pipe bombs

what are pipe bombs filled with

nails, debris

what are pressure cookers

can be a bomb, build pressure until they explode

what are car bombs

difficult to identify, the car itself becomes sharpel

what are letter bombs

small amount of high explosive hidden inside a letter or package

what are letter explosives meant to do

be stable in mail and blow when opened

what are liquid explosives mostly in

toothpaste, shampoo , lotion

why does the bomb squad do?

they search for un detonated explosives as well evaluate the structural integrity of any damage damage building

what bureau sets laws on manufacturer sales, and use of explosives

The bureau of alcohol, tobacco, firearms, and explosives