Most are water based, with a thickening power to make it heavier, the purpose of foam, in a firefighting use is to smother and deprive the fire of oxygen
by foam extinguisher
Alcohol-resistant foam is typically used to extinguish fires involving polar solvents, such as acetone or methanol. This type of foam forms a barrier between the fuel and the oxygen in the air, smothering the fire and preventing reignition.
Laboratory fire extinguishers shoud be located just inside each exterior door. To be as safe as possible they should probably be of the type AR-AFFF, that is Alcohol Resistant Aqueous Film Forming Foam. While these foam extinguishers are messy they extinguish the fire AND THEN they provide reflash protection. Other extinguishing agents will extinguish the fire but if all the elements of a fire are still there, oxygen fuel and temperature, then the fire can reignite. AR-AFFF prevents that and prevents the foam from degrading due to solvents which tend to be present in Laboratories.
To extinguish a paraffin fire, you can use a Class B fire extinguisher specifically designed for flammable liquids or smother the fire by covering it with a damp cloth or a fire blanket. Avoid using water, as it can spread the fire due to the oil content in paraffin. Shut off the source of the fuel if possible.
To extinguish an oil fire on an oil tanker, it's crucial to avoid using water, as it can spread the fire. Instead, specialized firefighting foam should be deployed to smother the flames and cut off the oxygen supply. Fire suppression systems onboard the tanker, such as fixed foam systems or portable extinguishers designed for flammable liquids, should be activated. It's also essential to follow safety protocols and coordinate with emergency response teams to manage the situation effectively.
The CO2 or the dry Chemicals can be used to extinguish Liquid Fire, though other extinguishes can be used like halogen extinguishers, BUT the halogen is doesn't help as much as it harms, because it causes a toxic gas, and there is Foam extinguishers they come handy too.
Not normal foam but carbon dioxide foam from a fire extinguisher. This special foam covers the fire and takes all the oxygen out of it, and with no oxygen, no fire!!!
The most effective method for extinguishing an oil fire is to smother it by cutting off its oxygen supply. This can be done by covering the fire with a fire blanket, sand, or a specialized foam designed for oil fires. Water should not be used to extinguish an oil fire as it can cause the fire to spread.
Removing oxygen from the fire triangle is referred to as "smothering" a fire. The fire triangle consists of heat, fuel, and oxygen, and eliminating any one of these elements can extinguish a fire. By depriving the fire of oxygen, it cannot sustain combustion, leading to its extinguishment. This method is commonly used in fire suppression techniques, such as using fire blankets or foam.
"foam" fire extinguishers are made for hydrocarbon fires...i.e: gasoline, diesel, etc. These fires are considered class "b" (flammable liquids), and are mostly used by professionals and in commercial and industrial settings. These extinguishers are charged with anther AFFF, FFFP, or AR-AFFF, however, these class of extinguishers are only rated class A & B fires and are hazardous to the environment, humans and animals in addition to being very corrosive.
Firefighters use trigonometry to determine the height of buildings and other structures. It is also used to measure distances and angles needed to reach the scene of a fire. Trigonometry is also used to calculate the flow of water or foam needed to extinguish a fire. Calculating the height of a building or structure Measuring distances and angles to reach the scene of a fire Calculating the amount of water or foam needed to extinguish a fireFirefighters use trigonometry to determine the best way to approach a fire and to ensure that the necessary resources are available. Without the use of trigonometry firefighters would not be able to accurately and efficiently respond to fires.
The foam cuts the connection of fire with air (oxygen) & thus puts out fire.