Crjs350 IP3

Apr 10th, 2015
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You are the supervisor of a newly formed arson investigation unit. Although you have some personnel with basic crime scene training, you must start from the ground up to train them in elements of arson fire investigation. You start your training by handing out a white paper that will provide information to them about fire, fuel, and accelerants. • Address the following in 3–5 pages: • Describe what a fire is in terms of its physical properties. • Identify and explain the 3 elements that make up the fire triangle. • Explain the oxidation process. • How is the process affected by how fast the oxidation occurs? • What are the primary accelerants? Identify and describe them. • What do they leave behind chemically after they burn? Explain. • How can investigators search for and find trace elements of the accelerants? • What are they looking for at the scene that indicates accelerants were used? • Be sure to reference all sources using APA style.

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CRJS350-IP3NameClassDateProfessorArson Investigation Fire is produced when rapid oxidation occurs and produces heat and light. Fire is a chemical reaction and without the presence of certain chemicals fire will not occur.. The actual flames in a fire consist of nitrogen, carbon dioxide, water, and oxygen and when additional chemicals are added this will cause the fire to put off a lot of heat. For example when gasoline is used to start the fire the heat form the fire will vaporize the gasoline and becomes a volatile gas. When the gasoline vapors get hot they emit light creating soot. The heat of the flame keeps the fuel at the original ignition temperature causing it to continue to burn as long as there is fuel and oxygen (Harris, 2012). Fire requires oxygen and a fuel source as well as another type of chemical for the combustion reaction to occur and flames to sprout. This is known as the fire triangle and consists of the elements of heat, fuel, and oxygen. If one of the elements is missing for the fire triangle the fire will die out. Heat is the energy that emits from the flames and assists to maintain the fire. Through heat the fire can spread if moisture is borrowed from the fuel. The more moisture content in the fuel the longer the fire will burn. Using gasoline as an example the more gasoline the longer the fire will burn because the gasoline will be slower to evaporate. Another aspect of the fire triangle is the fuel. The fuel

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