Teachers orientedTeachers oriented6.COMBUSTION AND 6.COMBUSTION AND

FLAMEFLAME

TODAY’S TOPIC TODAY’S TOPIC

DIFFERENT ZONES OF DIFFERENT ZONES OF CANDLE FLAMECANDLE FLAME

DIFFERENT ZONES OF CANDLE DIFFERENT ZONES OF CANDLE FLAMEFLAME

A FLAME CONSIST OF THREE ZONES. THESE ARE : A FLAME CONSIST OF THREE ZONES. THESE ARE : : INNERMOST ZONE: INNERMOST ZONE

: MIDDLE ZONE: MIDDLE ZONE: OUTER ZONE: OUTER ZONE

THE INNERMOST ZONE OF THE INNERMOST ZONE OF CANDLE FLAMECANDLE FLAME

THE INNERMOST ZONE OF FLAME IS DARK OR BLACK IN THE INNERMOST ZONE OF FLAME IS DARK OR BLACK IN COLOUR, THE INNERMOST ZONE OF FLAME CONSIST OF COLOUR, THE INNERMOST ZONE OF FLAME CONSIST OF HOT UNBURNT VAPOURS OF COMBUSTIBLE MATERIAL HOT UNBURNT VAPOURS OF COMBUSTIBLE MATERIAL

(SAY WAX VAPOURS) (SAY WAX VAPOURS)

THE MIDDLE ZONE OF CANDLE THE MIDDLE ZONE OF CANDLE FLAMEFLAME

THE MIDDLE ZONE OF A CANDLE FLAME IS YELLOW IN THE MIDDLE ZONE OF A CANDLE FLAME IS YELLOW IN COLOUR. IT BRIGHT AND LUMINOUS MEANS LIGHT GIVINGCOLOUR. IT BRIGHT AND LUMINOUS MEANS LIGHT GIVING

THE FUEL VAPOURS BURN PARTIALLY IN THE MIDDLE THE FUEL VAPOURS BURN PARTIALLY IN THE MIDDLE ZONE BECAUSE THERE IS NOT ENOUGH AIR FOR BURNING ZONE BECAUSE THERE IS NOT ENOUGH AIR FOR BURNING

IN THIS ZONE. IN THIS ZONE.

THE OUTER ZONE OF A THE OUTER ZONE OF A CANDLE FLAMECANDLE FLAME

THE OUTER ZONE OF A FLAME IS BLUE IN COLOUR. IT IS THE OUTER ZONE OF A FLAME IS BLUE IN COLOUR. IT IS NON-LUMINOUS ZONE (MEANS WHICH DOES NOT NON-LUMINOUS ZONE (MEANS WHICH DOES NOT PRODUCE MUCH LIGHT). IN THIS ZONE COMPLETE PRODUCE MUCH LIGHT). IN THIS ZONE COMPLETE

COMBUSTION OF A FUEL TAKES PLACE BECAUSE THERE IS COMBUSTION OF A FUEL TAKES PLACE BECAUSE THERE IS PLENTY OF AIR ARROUND IT. AND ALSO IT IS THE PLENTY OF AIR ARROUND IT. AND ALSO IT IS THE

HOTTEST ZONE IN THE CANDLE FLAME.HOTTEST ZONE IN THE CANDLE FLAME.

ACTIVITIES RELATED TO THIS ACTIVITIES RELATED TO THIS TOPICTOPIC

ACTIVITY TO SHOW THAT THE ACTIVITY TO SHOW THAT THE INNERMOST ZONE OF A CANDLE INNERMOST ZONE OF A CANDLE

FLAME CONSIST OF UNBURN FLAME CONSIST OF UNBURN WAX VAPOURSWAX VAPOURS

ACTIVITY TO SHOW THAT THE ACTIVITY TO SHOW THAT THE MIDDLE ZONE OF CANDLE MIDDLE ZONE OF CANDLE

FLAME CONSIST OF UNBURNT FLAME CONSIST OF UNBURNT CARBON PARTICLES CARBON PARTICLES

ACTIVITY TO SHOW THAT THE ACTIVITY TO SHOW THAT THE OUTERMOST ZONE NON-OUTERMOST ZONE NON-

LUMINOUS ZONE OF A FLAME IS LUMINOUS ZONE OF A FLAME IS THE HOTTESTTHE HOTTEST

QUESTIONS FOR ABOVE QUESTIONS FOR ABOVE AVERAGE STUDENTS AVERAGE STUDENTS

1 name the various zones of candle flame and put them in 1 name the various zones of candle flame and put them in increasing order according their temperature? increasing order according their temperature?

2 why does in innermost zone of flame consist of hot and 2 why does in innermost zone of flame consist of hot and unburn vapours of combustible material?unburn vapours of combustible material?

Ans 1 the three zones of candle flame are innermost Ans 1 the three zones of candle flame are innermost zone, middle zone, and outer zone. zone, middle zone, and outer zone.

According to increasing Order According to increasing Order innermost zone< middle zone< outer zone. innermost zone< middle zone< outer zone.

Ans2 The innermost zone consist of hot, unburnt vapours Ans2 The innermost zone consist of hot, unburnt vapours of combustible material because there is very less air.of combustible material because there is very less air.

Questions for average studentsQuestions for average students11 Define ignition temperature ?Define ignition temperature ?

2 In which zone of a candle flame complete combustion of 2 In which zone of a candle flame complete combustion of fuels is take place to make light?fuels is take place to make light?

Ans1 The lowest temperature at which the substance Ans1 The lowest temperature at which the substance catches fire and starts burning it is called its ignition catches fire and starts burning it is called its ignition

temperature.temperature.

Ans2 In the outer zone complete combustion of fuels Ans2 In the outer zone complete combustion of fuels takes place.takes place.

Question for below average Question for below average studentsstudents

1 Name 3 combustible/non-combustible objects?1 Name 3 combustible/non-combustible objects?2 Which is the coldest zone of candle flame?2 Which is the coldest zone of candle flame?

Ans1 combustible materials : wood, paper, plastic.Ans1 combustible materials : wood, paper, plastic.Non-combustible material : iron, steel, glass.Non-combustible material : iron, steel, glass.

ans2 The coldest zone of candle flame is innermost zone.ans2 The coldest zone of candle flame is innermost zone.

THANK YOU!THANK YOU!

BY :BY :

MEGHAMEGHA

88THTH A A