water contains oxigen ,but it control the flame .why?

Answer 1

because water also contains hydrogen in more ratio than oxygen. hydrogen diffuses the fire.

Answer 2

Water is the most common chemical for class A fires and if available in sufficient volume can be quite effective. Water extinguishes flame by cooling the fuel surfaces and thereby reduces the pyrolysis rate of the fuel. The effectiveness against the combustion sustaining effect of burning gases is minor for extinguishers, but water fog nozzles used by fire departments create water droplets small enough to be able to extinguish flaming gases as well. The smaller the droplets, the greater the effectiveness water has against burning gases.

Most water based extinguishers also contain traces of other chemicals to prevent the extinguisher from rusting. Some also contain surfactants which help the water penetrate deep into the burning material and cling better to steep surfaces.

Water may or may not help extinguish class B fires. It depends on whether or not the liquid's molecules are polar molecules. If the liquid that is burning is polar (such as alcohol), then water can be an effective means of extinguishment. If the liquid is nonpolar (such as large hydrocarbons, like petroleum or cooking oils), the water will merely spread the flames around.

Similarly, water sprayed on an electrical fire (US: Class C, UK: Class E) increases the likelihood that the operator will receive an electric shock. However, if the power can be reliably disconnected and a carbon dioxide or halon extinguisher is not available, clean water actually causes less damage to electrical equipment than will either foam or dry powders. Special spray nozzles called fog nozzles, equipped with tiny rotating devices called spiracles replace the continuous water jet with a succession of droplets, greatly increasing the resistivity of the jet. These should however be used by skilled personnel, since these complex nozzle assemblies may difficult to use effectively without training.

Answer 3

In water, oxygen is chemically bonded with hydrogen to give H2O. H2O is thus a compound and a compound doesn't inherit the characters of its parent elements.

So Water doesn’t inherit the character of oxygen to help in burning.

Also, water has a boiling point of 100 Deg Calculus and it has a good heat capacity. So it can absorb the entire heat of a flame to get vaporize. So, it helps in controlling flames.

Answer 4

i can suggest why water is used :

Studies by numerous laboratories have identified four prime mechanisms through which water spray could influence the ignition and propagation of a fire or explosion in a flammable atmosphere. Water spray has been used to:

ventilate or otherwise reduce the concentration of the fuel to a level below that which is flammable,
raise the required ignition energy beyond that available,
render the flammable atmosphere inert, or
quench or prevent the propagation of an incipient or developed flame front.
In addition, water droplets in spray may absorb soluble vapors or gases under certain conditions.

Answer 5

Fire exists based on a tetrahedron principle and all sides have to be present for fire to exist.
-Heat
-Fuel
-Oxygen
-The uninhibitted chemical chain reaction

If you eliminate one side of the tetrahedron the fire will go out. Water is used for cooling, it takes heat out of the equation. The average class A or B type fire doesnt produce enough heat to break down water into its basic elements.

I have seen a fire at a machine shop that machined Aluminium, Magnessium and Titanium. Those metals in a fine compound such as the shavings from machining are very flammable and burn incredibly hot. Those metals are also water reactive once they are involved with fire. This fire was so hot from the metals burning that it broke down the water coming from the sprinkler system and fueled the fire even more.

Looking at the fire tetrahedron there are a few ways to extinguish the metal fire. Fuel, let it burn up, or interrupt the chemical chain reaction by using another chemical such as C02/Halon 1311, which displaces O2, or a chemical called Metal X or Purple K both trade names for chemicals used to extinguish metal fires.

Hope that helps and doesnt confuse

Answer 6

It controls the flame because the water suffocates the flame from getting oxygen because the oxygen is mixed with hydrogen

Answer 7

The Oxygen in Water is chemically bonded to two Hydrogen atoms, and is therefore not useable for burning. When atoms are chemically bonded, the properties of the original atoms no longer have effect. The new property of the two Hydrogen and one Oxygen atoms when they are chemically connected turns out to be the opposite of the individual atoms (it does not burn, and can be used to put it out). The only way to "burn" water, is to disconnect the atoms from each other--usually done by surging electricity through water (it is called electrolysis); this separates the Hydrogen atoms and the Oxygen atoms from each other, and then the individual atoms regain their properties (in this case, they can now burn).

Answer 8

Water is in a lower energy state and thus won't burn. Simple really. Burning hydrogen and oxygen makes water but not the other way around. You need energy to seperate the oxygen from the hydrogen in the water and fire just won't break those chemical bonds.

Answer 9

nicely, annoying to declare. Assuming that it is now dry. turn off the breaker and supply it a minute and then turn it decrease back on. If it remains on then take a seem on the administration panel if it fairly is working, fantastic, if it fairly is not then we've a undertaking. The water shorted out the panel and it will could get replaced. the two call a repairman or in case you have stable electric powered information, take the kind selection to an equipment fix factors keep and set up the hot one your self. stable success

Answer 10

Just because a molecule contains oxygen doesn't mean it is flammable. CO2 is used in fire extinguishers, but still contains lots of oxygen. The key is free oxygen gas, which is very flammable. Oxygen, when bound to other atoms or molecules, is inflammable, due to the stability in the valence orbital formed in the molecule. It is much less reactive in a bound state than in its molecular form.

Answer 11

First off you spell oxYgen wrong. Water controls flame because of its molecular structure which makes it what it is Hydrogen and Oxygen just doesnt mix with fire.