Draw a labelled diagram of a candle flame and explain what happens in each zone.
A candle flame can be divided into three zones (as seen in the diagram).
Innermost zone: This appears are very dark blue or black in colour. This part consists of hot, unburnt vapors of the combustible fuel. This is least hot / coldest part of the flame.
Middle zone: This part of the flame appears yellow in colour. It is very bright and luminous. In this zone, the fuel vapors burn partially due to the limited access to air. This partial burning leads to the production of carbon particles, which appear as smoke and soot. It has a moderate temperature.
Outermost zone: This part of flame appears blue in colour. In this zone, complete combustion takes place due to complete access of air around it. This is the hottest part of the flame and therefore, has the highest temperature. This is the thinnest zone.
Inner most zone: Black colour