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Firefighting & Composites Indyah Chatman Asyah Chatman John Nagy.

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Presentation on theme: "Firefighting & Composites Indyah Chatman Asyah Chatman John Nagy."— Presentation transcript:


2 Firefighting & Composites Indyah Chatman Asyah Chatman John Nagy

3 Firefighting A fire is a combustion reaction that requires oxygen as a reactant. Firefighters try to prevent oxygen from reaching the burning substances. Firefighters often use water or carbon dioxide for this purpose, but these materials make some types of fires more dangerous.

4 Firefighting A fire fighter must understand how fires behave and how they can be extinguished, it is necessary to understand physics and chemistry. The chemical processes shows how these work together in the phenomenon that we call fire. Extinguishing fires is a matter of interrupting one or more of these processes so that burning cannot continue. Firefighters will appreciate that it is, therefore, important to acquire a good understanding of what happens in a fire in order to be able to choose the best method available to extinguish it and to avoid making it worse.

5 The Fire Triangle  OXYGEN- for combustion to occur approximately 16% of the air surrounding a fuel must be oxygen. In normal circumstances air contains around 21% oxygen. There are however some substances that contain sufficient oxygen in their make- up to support combustion. HEAT-is required to raise the temperature of the fuel so that it turns to vapor and reaches its ignition temperature. The heat can be generated by Compression of gases Electrical energy Friction Chemical action Hot surfaces Open flame FUEL- can be in either solid, liquid or gas form but solids and liquids must first be converted into vapors for combustion to occur. There are some other terms that a firefighter must be able to identify with, in order to fully understand the combustion process.

6 To put out a kitchen grease fire use baking soda!!

7 The 4 Fire Classes Class A: Ordinary combustibles. 2Class B: Flammable liquid and gas. Class C : Electrical. 4Class D: Metal.

8 If this catches on fire what class is in?

9 Class C because it is an electrical wire

10 1. Cool the fuel 2. Stop Supply Of Oxygen 3. Trap Combusti on How To Stop A Fire!!!

11 What Fire Class Does This Picture Represent???? A. Class C B. Class A C. Class B D. Class

12 Got Ya!!!! The correct answer is choice B. Class A

13 Theses are a few ways to stop a fire

14 Composites

15 What are composites? Composites-is a type of material made from two or more other different materials which remain distinct from each other after joining. For example: Concrete is a composite material made from cement, water and an aggregate

16 How Composites Are Useful A lightweight material Composites can be made by embedding fibers in a plastic base Fibers can be glass, graphite, or synthetic fabric such as nylon. Composites are flexible, strong and low in density.

17 Composites found around you.. Concrete Fiberglass bathtub/showers

18 Which Is Made Up Of Composites???

19 C. A sports car

20 Just To Clear Some Thing Up! Just To Clear Some Thing Up!

21 Is cotton considered a composite? Why or why not? What fire class would burning bacon grease be in and how would you put it out?

22 Hopefully you learned something new

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