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 is weightless, and it does float away. As it floats away from the heat, it stops glowing and becomes just regular gases in the air. The stuff floating up from the fire was part of the fire, once. It needs the fuel to keep burning, glowing, etc. so as it goes up, it stops being fire.
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