Fires and Explosives
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What are some challenges of a fire scene?
- The remains may be:
- -Difficult to recognize
- -Commingled (mixed up with other burned objects)
- -Extremely burned & fragments
FOUR INITIAL STAGES OF THE BODY:
1) Soft tissue charring, pulgistic psture due to muscle contraction
2)Burning focuses on hands, feet, & area with small amounts of soft tissue.
LATER STAGES: CHARRED TO CALCINED
- 1) Charred bones- color changes
- -Yellow to brown > progresses towards balck as organic components burned off.
No DNA is recovered at this point
- 2)Calcine bones (i.e, cremated)
- -Gray to white - representing final stages of burning
- - this is the result of burning away of organic componets of bone
TO WHAT PERCENTAGE CAN BONES SHRINK TOO?
WHAT IS A FIRE?
accompanied by production of heat and light!
WHAT IS AN EXPLOSIVE?
Sudden conversion of potential hear energy into kinetic energy
involves production & release of gases under pressure
WHAT ARE SOME PURPOSES OF FORENSIC FIRES INVESTIGATION?
The determination of the fire and or explosive occured must be determined in order to prevent it in the near future.
Investigation of the fire of origin and cause
WHAT ARE FOUR COMPONENTS REQUIRED FOR A FIRE?
Uninhibited chemical chain reactions
WHAT ARE THE THREE BASIC STATES FUEL IS FOUND IN?
- Vapor - fuel can only be volatilized & consumed in vapor state.
WHAT ARE SOME TYPE OF FIRES?
- Chemical fires - rapid oxidation
- Mechanical - overheating of machines (product of friction)
- Electrical- wiring could be off. electrical malfuctions
- Compressed gases- compression of molecules
- Nuclear- splitting atoms
WHAT ARE THREE COMMON FORMS OF HEAR TRANSFER?
CONDUCTION: transfer of hear through direct contact
CONCTION- transfer of heat through by a circulating medium (air, liquid)
RADIATION- transfer of heat through invisible waves (travels 186 miles/second)
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