Physics of Wildland Firefighting

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Virtually everywhere in the United States is affected to one degree of another by wildland fires. Even if a community is not directly involved with the fire itself, chances are that some of its members have gone to help fight wildland fires in other areas of the country by providing manpower, financial support, or other humanitarian aid. Policies regarding the handling of wildland fires continue to change and evolve as new information is learned each fire season. Attitudes have changed between complete wildland fire suppression to no suppression at all. We now seem to have reached a balance between the two schools of thought and fall somewhere in the middle. Physics and Chemistry of Fire Fire Triangle There are three main components to the fire triangle: fuel, heat, and oxygen. Matter States Matter exists in three basic states: solid, liquid, or gas. A substance experiences a phase change when the physical characteristics of that substance change from one state to another state. Perhaps the most recognizable examples of phase changes are those changes from a solid to a liquid or a liquid to a gas. When a substance goes through a phase change, there is a change in the internal energy of the substance but not the temperature of the substance (Serway, et al. 611). Combustion Combustion is a rapid, continuous reaction that usually takes place in the gas phase. Wood is an organic compound primarily comprised of cellulose. For wood, the phase change from a solid to gas is almost instantaneous as combustion occurs (Coleman, et al. 95). Ignition occurs when an outside source is no longer needed to sustain combustion (Coleman, et al. 87). Heat Heat is a physical characteristic of energy that is produced as energy... ... middle of paper ... ...bie. "WILDLANDFIRE.COM." 1997-2005. March 18, 2005. http://www.wildlandfire.com # Alaska Fire Service. "U.S. Department of the Interior - Bureau of Land Management." 2002-2005. March 20, 2005. http://fire.ak.blm.gov # Coleman, Ronny J., et al.Fighter's Handbook: Essentials of Firefighting and Emergency Response. Delmar/Thompson Learning, Stamford, CT, 2000. # National Wildlife Coordinating Group Training Working Team. Wildland Fire Suppression Tactics Reference Guide. National Wildlife Coordinating Group, Boise, ID, 1996. # Perry, Donald G.Wildland Firefighting: Fire Behavior, Tactics and Command. Fire Publications, Inc., Bellflower, CA, 1990. # Serway, Raymond, et al.Physics for Scientists and Engineers. Thompson/ Brooks/Cole, Belmont, CA, 2004. # Teie, William.Fire Officer's Handbook on Wildland Firefighting. Deer Valley Press, Rescue, CA, 1997.

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