Physics of a Fire :: physics fire

Fire is a chemical reaction whcih needs three things to be present so it can happen Oxygen, Fuel, and Heat.If one of these is not present, the fire cannot start. If one of these is interpreted from a fire it give go emerge. save how does this all ferment?OxygenWe all breathe Oxygen (O) everyday - in fact, without it we would suffocate. But did you know that fire breathes Oxygen a care? And, like us, without Oxygen a fire will also suffocate.When Oxygen in the air combines with combustible vapours given off by Fuels - heat is produced and then firing off can occur.Without complete Oxygen, ignition cannot happen. In the opposite way, if there is too much Oxygen then the vapours wont be concentrated enough to combust. The ratio of vapour to Oxygen is known as the explosive or inflammable unsex and is different for each gas or vapour.HeatCombustion occurs when flammable vapours mix with air (Oxygen) and are ignited by a spark or flame.Solids give off flammable vapours by being heated. Certain solids such as paper or flour appear to ignite almost instantly. This is beca exercise they give off vapours and elapse a flammable temperature almost immediately. In fact, fine dusts dispersed in the air can explode because they give off vapours and ignite so quickly it appear to happen instantly.Other solids like whole tone take longer to ignite because they are more dense and so dont give off flammable vapours so easily.FuelSo, in our fire triangle weve got Oxygen and Heat, but we also need something that will burn - this is our Fuel.Fuels can take almost any formSolids like wood, fabric, rubber and plastic.Liquids such as petrol, oil, cooking oil or plain nail varnish remover.Gases like propane, butane and natural gas.If a fire broke out in your home today, would you automatically know which fire extinguisher to use? What would happen if you used a Class A fire extinguisher on a fire in the electrical service add-in in your basement? Answer youd possibly be electrocuted if the extinguishing mover is a liquidA long time ago, the fire protective cover industry recognized the need to classify extinguishers according to the many kinds of intense materials encountered in a fire. For example, Class A, water-type fire extinguishers cannot be used on the electrical fires because the extinguisher operator could be seriously injured by the conduction of electricity by the stream of water from their extinguisher.