Question

Draw a labelled diagram of a candle flame and explain what happens in each zone.

Answer 1

There are three zones in a candle flame. All these three zones have different colour and temperatures.

About Outer zone:

• This is the first zone which is blue in colour.
• This is the non-luminous part of the flame.
• This zone is the hottest in temperature when compared to the other zones.
• In the outer zone, complete combustion of fuel takes place.

About middle zone :

• This is the second zone which is yellow in colour.
• In the middle zone, partial combustion of fuel takes place.
• This zone is moderately hot.

About innermost zone :

• This is the third and the innermost zone.
• This zone is black due to the presence of unburnt wax vapours.
• This zone is least hot.