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When you blow slowly, you are actually replenishing the flame with air that has more oxygen than the used up air you displaced. When you blow hard, some of the following things can make the flame go out. The velocity of the air could be lowering the air pressure around the candle too much causing it to be unable to extract enough oxygen to sustain the flame. The amount of carbon dioxide in your breath could also make it go out. Try this experiment. Take a deep breath and hold it for 30 seconds. then get real close to the candle and blow slowly. It will probably go out, since most of the oxygen in your breath is gone and what is left in its place is carbon monoxide. It could also be the cooling effect of your breath on the wax when you blow hard. Each case will probably be a little of each.

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Q: Why don't candles go out when you blow slowly?
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