how can we show that air is needed for burning
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Answer:Fire is a chemical reaction that creates light and heat from oxygen and fuel. A lit candle needs to draw oxygen from the air in order to continue burning. If you limit the amount of air available, the candle's flame eventually goes out once it uses up all the oxygen.
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we can show this when light a candle and then cover it with a glass. After some time we see that the candle is extinguish.
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