How to Jump

Fires start when a flammable and/or a ignescent material, in combination with a sufficient quantity of an oxidant such as atomic number 8 gas or an another(prenominal)(prenominal) oxygen-rich compound (though non-oxygen oxidizers exist that house retouch oxygen), is exposed to a source of heat or ambient temperature above the dissipate point for the fuel/oxidizer mix, and is able to sustain a rate of rapid oxidation that produces a chain reaction. This is commonly called the fire tetrahedron. Fire cannot exist without all of these elements in place and in the right proportions. For example, a flammable liquid willing start burning only if the fuel and oxygen be in the right proportions. Some fuel-oxygen mixes may require a catalyst, a substance that is not directly involved in any chemical reaction during combustion, but which enables the reactants to combust much readily.

Once ignited, a chain reaction must earn place whereby fires can sustain their own heat by the further release of heat energy in the wait on of combustion and may propagate, provided there is a continuous cut of an oxidizer and fuel.

If the oxidizer is oxygen from the surrounding air, the presence of a force of gravity, or of some similar force caused by acceleration, is necessary to produce convection, which removes combustion products and brings a supply of oxygen to the fire.



Without gravity, a fire rapidly surrounds itself with its own combustion products and non-oxidizing gases from the air, which fend off oxygen and extinguish it. Because of this, the risk of fire in a spacecraft is small when it is coasting in inertial flight. Of course, this does not obligate if oxygen is supplied to the fire by some process other than thermal convection.

Fire can be extinguished by removing any one of the elements of the fire tetrahedron. Consider a inseparable gas flame, such as from a stovetop burner. The fire can be extinguished by any of the following:

routine off the gas supply, which removes the fuel source;
covering the flame...If you require to get a full essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .