1. FLAME

2. WHAT EXCATLY FLAME IS?? a hot glowing body of ignited gas that is generated by something on fire.

3. Only substances that vaporize burn with a flame Kerosene rises up the wick of a stove and vaporizes before burning. The vapour burns with the flame Example When a candle burns hot molten wax rises up in the wick and vaporizes. The wax vapour burns with flame

4. Blue flame When there is sufficient supply of oxygen the substances burn completely producing a non- luminous or blue flame Example: burning of LPG

5. Did you know The flame of a Bunsen burner is blue when the air hole is open and adjusted for the right amount of air. However if the air hole is closed the supply of air hole is closed the supply of air is insufficient and the flame becomes yellow.

6. Candle flame

7. Candle flame has 2 parts The wax that serve as a fuel. It is hydrocarbon obtained from petroleum The wick made up of a material that can absorb liquids

8. When a candle is lighted the wax in the wick melts. The wick absorbs the liquid wax and pulls it upward. The heat of the flame vaporizes the wax- it is this wax vapour that burns The wick burns because when the wax vaporize, it takes heat from the wick and cools it.

9. Parts of flame There are four parts of flame

10. non- luminous zone The non- luminous zone or zone of complete combustion is the hottest part of candle flame. It is outermost zone of flame. It is very thin and may not be visible. Complete combustion occurs. The flame appears blue

11. luminous zone The middle zone, luminous zone or zone of incomplete combustion. The wax vapour don’t burn completely because of inadequate supply of oxygen. It has bright yellow colour because of incomplete combustion. The flame leaves black soot on an object placed in the zone

12. dark zone The dark zone or zone of no combustion is the least hot. It is the innermost zone of the flame, in the area surrounding wick. Here the wax vapour don’t come in contact with oxygen, and hence don’t burn

13. Blue zone Blue zone is small area at base of wick. Here the carbon monoxide produced in the inner zone due to incomplete combustion burns with a blue colour

14. Thank u