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 occurs when a chemical reaction produces enough heat the surrounding air is hot enough to glow in wavelengths our eyes can see. Once you get far enough from the reaction, the air cools to the point it no longer gives off that light.
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