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A '''fire extinguisher''' is a handheld, typically cylindrical, device used to extinguish small [[fire]]s. 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]]).

[[File:FireExtinguisherABC.jpg|thumb|right|A fire extinguisher]]A '''fire extinguisher''' is a handheld, typically cylindrical, device used to extinguish small [[fire]]s. Such devices contain a fire-suppressive agent, either under constant pressure or with the ability to quickly pressurize, and are used by spraying this suppressive agent over the base of a fire, smothering the fire. Modern extinguishers are almost always under constant pressure, but some (especially older types) use a chemical reaction to create a propellant gas.  This kind must be turned upside-down when used to create the needed pressure.  Fire extinguishers are generally 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:  

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

* Class B: flammable liquids, such as grease, oil, and gasoline.  

* Class B: flammable liquids, such as grease, oil, and gasoline.  

* Class C: electrical fires.  

* Class C: electrical fires.  

* Class D: flammable metals.

* 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.

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

[[category:tools]]

* [[Fire safety]]

 

[[Category:Safety]]