Flame is a complicated process. As wood heats up past it’s ignition point, it starts chemically breaking down into flammable gasses and soot/other impurities. Those flammable gasses reacting with oxygen are the flame…which is hot enough to heat more wood that breaks down. The more soot and impurities, generally the larger and brighter the flame.
This is why more pure flames like propane have smaller actual flames, and some fuels will even have invisible flames.
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