3. How will you prove that air supports burning?
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Cover the burning candle with a glass jar. After few minutes the candle is extinguished. As the supply of air is stopped due to glass jar the burning of candle is also stopped. This experiment proves that air supports burning.
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You will notice that the candle covered with inverted glass tumbler blows out after some time whereas the other candle continues to burn. This happens because there is no air inside the glass tumbler. However, the air initially present in the glass tumbler is used up in burning. This shows that air supports burning.
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