Firefighting & Composites Indyah Chatman Asyah Chatman John Nagy
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.
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.
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.
To put out a kitchen grease fire use baking soda!!
The 4 Fire Classes Class A: Ordinary combustibles. 2Class B: Flammable liquid and gas. Class C : Electrical. 4Class D: Metal.
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
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.
Composites found around you.. Concrete Fiberglass bathtub/showers