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Chemistry in Firefighting

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Zachary Armstrong

on 9 June 2015

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Transcript of Chemistry in Firefighting

Introduction to chemistry in firefighting
Chemistry is largely important for why Firefighters are so successful, in putting out all types of fires. The fire crews main objective is to cut off the oxygen from the flame, breaking the conditions for combustion (Scalf, J. (2014, August 27). Main concepts in my presentation are: combustion, hazardous reactions, extinguishing different types of fire extinguishers, and fire retardant clothes.
Chemistry in firefighting
Fire retardant clothes
This video describes how this flame resistant clothing eliminates oxygen from clothing not allowing the flame to start.
extinguishing different types of flames
The types of fires are broken down in to class A through D and for each class there are other ways to extinguish them. Water and foam fire extinguishers only work on class A fires for cooling down with water and foam absorbing oxygen. Carbon dioxide extinguisher is effective for class B and C fires because carbon dioxide bonds with oxygen suffocating the fire. A dry chemical fire extinguisher works by interfering with fires chemical reaction making a barrier to the fuel source. Dry chemical is successful in putting out class A, B, and C fires. Finally the Dry powder extinguishers are good for eliminating class D and K fires by taking away the fuel from the oxygen. types o.
Why materials catch on fire
Conclusion
Combustion is something firefighters have to be focused on everyday, because with combustion and fires go hand and hand together. With out a working knowledge of chemistry we would not know how to extinguish the worlds most dangerous fires putting millions of peoples lives in jeopardy.
Combustion
Hazardous reactions
Firefighters are exposed to all types of fires
on the job, and not all flames will be put out with water. The most combustible substance on Earth is chlorine trifluoride. The substance is toxic corrosive and colorless being able to burn sand plus other nonburnable substances.
Firefighters cannot fight this chemical for safety they will let it burn out on its own(Helmenstine, P. A)
. In rare cases such as this adding water will increase the intensity, firefighters need a background in chemistry to recognize the rare chemicals.
chemical formula
U + 3 ClF3 → UF6 + 3 ClF
References
Scalf, J. (2014, August 27). Login - Fire Engineering. Retrieved June 7, 2015, from http://www.fireengineering.com/articles/2014/08/an-introduction-to-the-chemistry-of-fire-going-beyond-the-basics.html
Fire occurs when oxygen , heat and fuel are combined created combustion. There is complete combustion and incomplete combustion, firefighters mostly work with incomplete combustion, causing excessive amounts of carbon (smoke) that is harmful to the lungs.(Eubanks, D. (2015)
Eubanks, D. (2015). Chapter 6, Lesson 1 Multimedia. Retrieved June 07, 2015, from http://www.middleschoolchemistry.com/multimedia/chapter6/lesson1
"How Its Made - Fire/Heat Resistant Clothing." YouTube. YouTube, n.d. Web. 08 June 2015.
Different materials burn at distinct temperatures and speeds due to how closely molecules are formed, and how much oxygen the substance has in it.(How things ignite. (2009, November 03)
How things ignite. (2009, November 03). Retrieved June 07, 2015, from http://www.sciencelearn.org.nz/
The University of Waikato
Helmenstine, P. A. (n.d.). What Is the Most Flammable Chemical? Retrieved from http://chemistry.about.com/od/firecombustionchemistry/f/What-Is-The-Most-Flammable-Chemical.htm

Types of Fire Extinguishers. (n.d.). Retrieved June 9, 2015. from http://www.femalifesafety.org/types-of-extinguishers.html
Full transcript