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
First of all, you need three things for fire to happen, heat, fuel and oxygen. Oxygen is not a fuel but provides a required component to the equation. Take away any one of these three components, and you can’t have fire.
Fire is a reaction, and during that reaction, some molecules release ~~are transformed into~~ their energy, in this case, heat and light. The fire itself is essentially mass-less. But the mass of the oxygen and fuel is being transformed into other compounds. ~~energy~~.
Edit: Oversimplification led to inaccuracy.
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