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Air is mostly Nitrogen, but that is not the "burning" part; Oxygen is probably what you are looking for, as that is the part that helps the candle burn, without there would be no fire. Or maybe you are looking for Carbon dioxide, that is what burning candles (which are mostly carbon) produces.

What gas causes a candle to burn?

Oxygen. It is the oxygen in the atmosphere that chemically combines with the wax of the candle to give Carbon dioxide gas and water vapor.

What does candle need from air to burn?

A candle requires oxygen (O2) to continue its combustion reaction and produce CO2 and H2O.

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15y ago

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