What’s in the air?

We had seen earlier that CO2 displaces air in a glass and the candle goes off. Let us see,  what happens when candle burns in air. We will do a very simple experiment. For this we need  a tall glass, a big and deep dish, some water and a mid-size candle.

Put  candle at middle of, the dish and fill the dish with water. Now light the candle and cover the flame with the glass. Now the candle burns isolated from the air outside.

After sometime, we see the candle flame goes out and some water rises inside the glass. Mark the amount of air inside the glass with a marker pen. Use a measuring cup to find ratio of air that got consumed.

Questions:

1. Why did the candle go out?
2. How much air was consumed?