They contain pressurized carbon dioxide and nitrogen and propel it as a stream of fire squelching agent to the fire. Other extinguishers may contain a powder such as potassium bicarbonate (KHCO3), liquid water, an evaporating fluorocarbon, or the propelling agent itself.
What is the chemical in fire extinguishers?
Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized with nitrogen or carbon dioxide (CO2) to propel a stream of fire-squelching agent to the fire.
Is fire extinguisher chemical change?
Fire is a chemical reaction between oxygen and the fuel. If you want to put out a fire, just get rid of one of those three things – fuel, oxygen or heat. … It also prevents oxygen from reaching the fuel. Most fire extinguishers work by separating the fuel from the oxygen.
What are the 4 types of fire extinguishers?
There are four classes of fire extinguishers – A, B, C and D – and each class can put out a different type of fire. Multipurpose extinguishers can be used on different types of fires and will be labeled with more than one class, like A-B, B-C or A-B-C.
What is fire extinguisher and its types?
There are two main types of fire extinguishers: stored-pressure and cartridge-operated. In stored pressure units, the expellant is stored in the same chamber as the firefighting agent itself.
|Fuel/heat source||Flammable gases|
What are Class A fires?
There are four classes of fires: Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.