Question

all zone of a candle and define it and also define flame​

Answer 1

A candle flame has 4 zones. These different zones are:

1. Dark zone: The dark zone is the area around the wick of the candle flame that consists of  unburnt wax vapour. When you ignite the candle, the molten wax moves up (due to a phenomena called the capillary action) and vaporizes around the wick creating a dark zone. This part is 'dark' because of the decomposed carbon particles formed due to vaporization. Also, it is the least hottest of all the four zones.

2. Luminous zone: This part of the flame is the region where incomplete combustion takes place and a lot of heat is generated. In this zone, the molten wax particles further vaporize in the presence of wax and vapor particles. This zone is present near the base of the flame. This part of the candle flame is typified by a yellowish flame.

3.Non-Luminous zone: The non-luminous zone is the region of complete combustion. If you look at a candle flame closely (just don't go too close), you will see an 'aura' formed around the candle. Since this is the zone of complete combsution (as there is plenty of oxygen present around the candle), it is also the hottest part of the flame. 

4. Blue zone: Just at the base of the flame you will observe a 'bluish hue'. This is due to the incomplete burning of carbon dioxide resulting in the formation of carbon monoxide.

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Answer 2

$\mathfrak{\underline{\underline{\large{Answer:-}}}}$

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There are three zone of a Candle

• Innermost Zone
• Middle zone
• Outermost zone

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$\bf{\large{\red{Innermost \:Zone}}}$

• This zone consists of unburnt wax vapour given off by the molten wax.
• It is the coolest part of the flame.
• it is black in colour.

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$\bf{\large{\red{Middle \:Zone}}}$

• This zone, partial Combustion of wax vapours takes place with the liberation of a lot of energy.
• It is yellow in colour.
• This energy partly decomposes the wax vapour into carbon particles.

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$\bf{\large{\red{Outermost\: Zone}}}$

• It is a zone of complete combustion of wax vapour and carbon particles.
• It is the hottest part of the flame.
• The air, from the sides of the flame, mixes with unburnt wax vapours and carbon particles and burns them completely to form carbon dioxide gas and water vapour.

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$\bold{\fbox{\large{Flame:-}}}$

• Flame defined as the region over which gases burn.
• When you burn a piece of paper, or a wax candle, flame is produced.