Fire extinguisher

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A fire extinguisher is a handheld, typically cylindrical, device used to extinguish small fires. Such devices contain a fire-suppressive agent, typically under pressure, and are used by spraying this suppressive agent over the base of a fire, smothering the fire out. Fire extinguishers are typically used in an emergency, and should not be wasted on routine, controlled fires (such as a campfire).

Modern fire extinguishers are rated for the types of fires they are effective against:

  • Class A: ordinary flammable solids, such as wood and paper.
  • Class B: flammable liquids, such as grease, oil, and gasoline.
  • Class C: electrical fires.
  • Class D: flammable metals, such as titanium or magnesium.

The steps in correct use of a fire extinguisher can be remembered by the acronym P.A.S.S.: Pull, Aim, Squeeze, Sweep.

See also

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