Answer :
Final answer:
The primary mechanism of extinguishment for Class A fires, which involve common materials like paper, wood, and cloth, is cooling. These fires are extinguished by reducing their heat using water or chemical foam from the extinguisher.
Explanation:
The primary mechanism of extinguishment for Class A fires is cooling. Class A fires involve ordinary combustibles like paper, wood, cloth, rubber, and many plastics. These materials burn at relatively low temperatures and are extinguished by reducing the heat. Extinguishers designed for Class A fires primarily work through water or chemical foam, which cools the burning material and eliminates the heat needed for the fire to continue.
All fires can be extinguished by cooling, smothering, starving or by interrupting the combustion process to extinguish the fire. One of the most common methods of extinguishing a fire is by cooling with water.
How to use a fire extinguisher
- Identify a clear exit/escape route. ...
- Stand back. ...
- Discharge extinguisher. ...
- P: Pull the pin on the fire extinguisher.
- A: Aim the extinguisher nozzle on the hose low, toward the base of the fire.
- S: Squeeze the handle or lever to discharge the extinguisher.
- S: Sweep the nozzle back and forth.
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