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A flame has the classical teardrop shape because of convective air flow; as the hot, thin air rises (less dense things rise, while more dense fluids sink), the combustion process is carried up with it. Cool dense air flows in below it, providing fresh oxygen to the flame.

In zero-G, hot things don't rise and cold things don't sink. (With no gravity, which way would be "rise" and which way would be "sink"?) Hot gasses expand - but there's no gravity to pull cold, dense material down and allow the hot, thin gasses to rise.

So in zero-G, a flame is circular - until it goes out, snuffed by the carbon dioxide that gathers around it. With no convection, fresh air can't get to it.

If you wanted to burn a candle in the space station, you would need to provide a tiny fan to blow the CO2 away and blow fresh air in to the flame. Of course, this would be an INCREDIBLY STUPID THING TO DO, because oxygen is precious and expensive; it has to be flown up by rockets!

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