Why is a candle flame repelled by magnets? It turns out to be a combination of diamagnetic soot particles and hot gas. Check out this Youtube video from user Applied Science.
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I should have mentioned in the video that the exhaust from a flame will be oxygen-poor, thus also making it more diamagnetic than normal air. Air is a mixture of nitrogen (diamagnetic) and oxygen (paramagnetic). Removing the oxygen will make the resulting gas more diamagnetic.
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