Why is it that when you run your finger through candle flame, you rarely feel the heat, but just a second of flame from petroleum gas can burn you good?
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Candles burn at a much lower temperature than natural gas because the flames have different fuels (wax for the candle and natural gas for the gas burner). A bigger temperature difference allows a faster transfer of energy, allowing a burn to develop from the gas burner before the candle.
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