question_answer 10)

How will you prove that air supports burning?

Answer:

Place a burning candle in a tray. Cover it with a glass jar. To make it air-tight, fill tray with water. After sometime, burning candle dims and goes off. Water level also rises up in the jar. It shows air support burning. During burning, oxygen is consumed and carbon dioxide is released. After sometime, no oxygen is left inside the jar and flame goes out. Once the candle goes off, the temperature surrounding the candle cools down and volume of air (carbon dioxide) decreases. Thus, water rises up little in the jar.