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How do you investigate an arson case?
The arson investigator observes the scene, collects and gathers physical evidence, and interviews witnesses. Using the information obtained, the arson investigator will determine if the fire was accidental or deliberate and identify a suspect. -
What chemicals are used in arson?
Many accelerants are hydrocarbon-based fuels such as gasoline (petroleum), diesel fuel, kerosene, turpentine, butane, and various other flammable solvents collectively known as volatile organic compounds (VOCs). -
What is the chemistry of fire in arson?
It involves the oxidation of fuel and emits energy in terms of heat and radiation. Therefore, fuel, oxygen, and heat are the three basic essential components to initiate fire. Any chemical substance (solid, liquid or gas) used to start a fire or increase the intensity or speed is known as fuel. -
How do you know if a fire is arson?
Physical Evidence of Possible Arson Burn pattern: multiple origins or unusual origin location. Presence/absence, and/or condition of ignition key. Ignition lock/switch condition. Accelerants in unexpected location(s) Missing accessories, components, or personal property. Components that have been tampered with. -
What is the chemistry of arson fire?
Because the reaction is exothermic, the product gases heat up and expand, and in turn can be harnessed to do work. In a fire, such as arson, this expansion generates plumes with predictable behaviors that leave distinctive markings at the crime scene. -
What is the difference between fire and arson?
By contrast, a fire caused by accident or ordinary carelessness is not arson, because criminal intent is lacking. Nonetheless, reckless activity—or burning without regard to consequences—can result in an arson conviction. -
What is the chemistry behind fire?
In order for a fire to take place there are 3 main ingredients that must be present: Oxygen, Heat and Fuel. In chemistry we call the type of reaction that produces fire a combustion reaction. -
How do arson investigators use chemistry?
By analyzing the gas chromatographic peaks from evidence recovered from fire-scene debris and comparing it to reference chromatogram of known flammable liquids, the arson investigator can identify the accelerant used to start the fire.
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