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
The fire is tied to the fuel source, like a log, which is burning. The visible flame which you see is a result of the combustion occurring at that fuel source. This results in heat and light. The heat rises, making the flame travel upwards.
The oxygen by itself can’t burn without the fuel source (which is fortunate, otherwise we’d all be dead of self-sustained skyfire).
So as the flame moves away from the fuel source, there is no longer any reaction generating heat or light and the visible flame dissipates as its energy radiates away.
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