Q.3 How will you prove that air supports burning?

Fix two small candle of the same length on the table. Light both the candles. Cover one of the candles with an inverted glass tumbler. Observe both the candles carefully.
We must have observed that the candle covered with glass tumbler got extinguished after some time, whereas the other candle continued burning. Then proved air support burning Because the glass which did not have oxygen, the candle was extinguished.