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Oxygen maintains combustion
Fire is an oxidation reaction - high temperature depletion between a fuel and an oxidizing agent (usually atmospheric oxygen)
The fires produce oxidized products, usually in the form of vapors, in a mixture called smoke.
The fire produces flames, and produces enough heat for self-sustaining combustion.
(Considering that the most common oxidizing agent is oxygen in the air)
Assuming oxygen is burned, just one spark, the oxygen in the air burns out ... and burns everything down.
This fact proves that this does not happen. So, the oxygen maintains the fire but does not burn ...
Under certain conditions, oxygen molecules combine to form ozone that has a strong odor, for example when there is thunder.
Always take precautions against fire. The fire can happen at any time ...