Model lesson on parts of flame by vijay grover

It is about how to teach parts of flame in science at secondary stage

1. Parts of Candle Flame Objectives: Name of parts of candle flame Composition of parts of candle flame Temperature of candle flame Nature of candle flame Significance of parts of candle flame

2. Definition of Flame A space /zone of burning of gas or vapor fuel to cover considerable region with constant shape maintained by the supply of fuel. The fuel can be solid, liquid or gas but finally burn as gas

3. Flame & its Types Flame: Types of Flame Laminar diffusion Flame Premixed Flame

4. How it works

5. Structure of a candle flame Outer zone (blue) Middle zone (yellow) Inner zone (black) (Complete combustion) (Partial combustion) Unburnt wax vapours Hottest part Moderately hot Least hot Luminous zone Non luminous zone

6. Parts of Candle Flame Zone 1: Dark zone (Fuel Evaporation) Zone 2: Blue zone (Complete Burning) Zone 3: Dark zone (Fuel Pyrolysis) Zone 4: Luminous zone (Partial Burning) Zone 5: Veil/Non Luminous zone (Complete Burning)

7. Emissions and Temperature

8. Heat, Light & Shape of Flame

9. Sectional Recapitulation Select the correct response 1. Hottest zone of candle flame is _______ Non luminous zone b) Dark zone c) Luminous zone d) none of the above 2. Lowest temperature zone is _________ Non luminous zone b) Dark zone c) Luminous zone d) none of the above 3. Complete burning of fuel tales place in ____ Black zone b) Blue zone c) Yellow zone d) all of the above 4. Match the following Pyrolysis i ) Blue zone CO 2 & H 2 O ii) Non-luminous zone Maximum oxygen iii) Luminous zone Partial combustion iv) Dark zone

10. Nature of Zones of Flame Oxidizing Flame Reducing Flame

11. Some Experiments by Michael Faraday (1861)

12. Environmental Impact of Flame Observed air concentrations (in mg/m 3 ) of various compounds subsequent to burning the equivalent of 600 g of candle mass, or one cigarette, in a room (50 m 3 ) where no air exchange is taking place

13. Final Recapitulation Select the correct response Oxidizing flame is Dark zone b) Luminous zone c) Non-luminous zone d) dead space 2. Reducing flame contains a)Carbon b)Water c)Carbon monoxide d) Carbon dioxide Select True/False 3. Wax is a hydrocarbon (T/F) 4. Candle flame is a premixed type flame (T/F) 5. Dead space is zone is also called main reaction zone (T/F) 6. Wax burns in vapor state in a candle (T/F) 7. All fuels form flame (T/F) 8.Dominant Yellow color of flame is due to CO gas (T/F)

14. T h a n k s for Being Patient Dr. Vijay Grover DAV College of Education, Abohar