Fire extinguishers contain different chemicals, depending on the application. Handheld extinguishers, which are commonly sold at hardware stores for use in the kitchen or garage, are pressurized …
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. The active material may be a powder such as potassium bicarbonate (KHCO3), liquid water, an evaporating fluorocarbon or the propelling agent itself.
What is inside a fire extinguisher & How it works?
As we mentioned before, fire extinguishers are filled with a substance called “fire retardant” which is designed to smother a fire and stop it from spreading. The most common fire retardants used in fire extinguishers are water, foam, …
The first fire extinguisher of which there is any record was patented in England in 1723 by Ambrose Godfrey, a celebrated chemist at that time. It consisted of a cask of fire-extinguishing liquid containing a pewter chamber of gunpowder. This was connected with a system of fuses which were ignited, exploding the gunpowder and scattering the solution. This device was probably used to a limited extent, as Bradley’s Weekly Messenger for , refer…
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What chemicals are in a fire extinguisher?
Fire extinguishers contain different chemicals, depending on the application. 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. The active material may be a powder such as potassium …
What is a fire extinguisher?
Fire extinguisher. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations.
Can water based fire extinguishers be used on flammable liquids?
Water-based extinguishers cannot be used safely on energized electrical fires or flammable liquid fires. 1⁄2 US gal) or 19-litre (5 US gal) non-pressurized metal or plastic container with a pump mounted to it, as well as a discharge hose and nozzle.
Why is fire extinguisher not effective on Class A fires?
This agent is not generally effective on class A fires because the agent is expended and the cloud of gas dissipates quickly, and if the fuel is still sufficiently hot, the fire starts up again. While liquid and gas fires do not usually store much heat in their fuel source, solid fires do.
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TYPES OF FIRE AND FIRE EXTINGUISHERS | WHICH FIRE EXTINGUISHER TO BE USED ON WHICH CLASSES OF FIRE Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher