With the help of an experiment, show that oxygen is necessary for burning of the candle.
Take a candle and light it. The candle will continue to burn due to continuously available fresh air providing the required oxygen for combustion.
Now, cover the burning candle by putting a bell jar over it. After a short time, the candle stops burning and gets extinguished. This happens because when the burning candle is covered with a jar, then the candle takes away the oxygen necessary for burning from the air enclosed in the jar. After some time, when all the oxygen of air inside the jar is used up, then the burning candle gets extinguished.
This proves that air/oxygen is necessary for the combustion of substances.
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