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How does a fire extinguisher work?
Quick answer
A fire extinguisher works by removing one of the three things a fire needs: heat, fuel, or oxygen. Most spray a substance that smothers the flames or cools them, breaking the chemical reaction of burning so the fire goes out.
Step by step
- Fire needs heat, fuel, and oxygen — the 'fire triangle.'
- Extinguishers remove at least one of these.
- Water cools the fire; foam and CO₂ smother the oxygen.
- Dry powder interrupts the burning chemical reaction.
- Different fire types need different extinguisher types.
People also ask
How does a fire extinguisher put out fire?
By removing heat, fuel, or oxygen — cooling the flames, smothering them, or chemically interrupting the burning reaction.
Why are there different types of fire extinguishers?
Different fires (wood, oil, electrical, metal) need different agents; using water on an oil or electrical fire can be dangerous.
How does a CO₂ extinguisher work?
It blankets the fire in carbon dioxide, displacing the oxygen so the flames can't keep burning, and it leaves no residue.
Part of the guide: Everyday Machines →