Question

Take a beaker with some water and place a lighted candle in standing position in it. Now cover the candle with a test tube. For how long the candle keep on burning?

Answer 1

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• The burning candle produces carbon dioxide and water in the form of water vapor. The glass becomes foggy due to this water. The flame goes out, of course, from a lack of enough oxygen in the glass. ... The water is pressed into the glass by the greater external air pressure.