To expand on the other replies here, fire is usually not a solid object burning in and of itself. Instead, it’s a hot object emitting fumes that burn in the air, where they’re much better mixed with oxygen.
For example, when you burn a candle, the wick mostly isn’t burning. It’s just hot enough for wax to be evaporating off of its surface, and then the resulting wax vapors burn in the air.
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