<P> Combustion is the chemical reaction that feeds a fire more heat and allows it to continue . When the fire involves burning metals like lithium, magnesium, titanium, etc. (known as a class - D fire), it becomes even more important to consider the energy release . The metals react faster with water than with oxygen and thereby more energy is released . Putting water on such a fire results in the fire getting hotter or even exploding . Carbon dioxide extinguishers are ineffective against certain metals such as titanium . Therefore, inert agents (e.g. dry sand) must be used to break the chain reaction of metallic combustion . </P> <P> In the same way, as soon as one of the four elements of the tetrahedron is removed, combustion stops . </P> <P> The oxidizer is the other reactant of the chemical reaction . In most cases, it is the ambient air, and in particular one of its components, oxygen (O). By depriving a fire of air, it can be extinguished; for example, when covering the flame of a small candle with an empty glass, fire stops; to the contrary, if air is blown over a wood fire with bellows, the fire is activated by the introduction of more air . In certain torches, gaseous oxygen is introduced to improve combustion . </P> <P> Some chemicals, such as fluorine gas, perchlorate salts such as ammonium perchlorate, or chlorine trifluoride, act as oxidisers, sometimes more powerful ones than oxygen itself . A fire based on a reaction with these oxidisers can be very difficult to put out until the oxidiser is exhausted; that leg of the fire triangle cannot be broken by normal means (i.e., depriving it of air will not smother it). </P>

What happens when you mix oxygen and fire
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