Oxygen and Nitrogen make up a significant part of the atmosphere. Fire always stretches upwards, assuming no wind, leading me to believe it’s less dense than air. Oxygen is highly flammable. That should be everything fire needs to sustain itself while flying away into the sky.
In: Chemistry
Fire needs fuel, oxygen and a heat source to burn. Take one away, and the fire goes out. So the flames itself are little tiny pieces of hot fuel floating through the air and getting consumed by the oxygen. They float away, get consumed and go out when either the fuel is gone or they cool down too much so they won’t stay lit anymore. Oxygen itself isn’t flammable. Oxygen is just what makes a fire possible.
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