1. A candle is mainly a source of light and heat.
2. A candle is made of wax in which a thick thread inserted wax in the candle melts when it is lighted by a match stick.
3. A little of wax forms vapour.
4. This vapour combines with oxygen in the air to form flame.
5. The heat of the flame melts more of the wax from the top of the candle.
6. The melted liquid wax moves upward through the thread. It also changes to vapour when it reaches the top of the wick and byrns with the flame.
