What is a Flame?

When any substances are burnt with the help of oxygen, a hot luminous gas emerges out. This gas is called flame.

Examples include kerosene oil, wax.

Structure of Flame:

Below are the layers of flame:

Outermost zone: It is blue in colour and is hottest amongst all the zones. In this portion, complete combustion takes place.

Middle zone: It is yellow in colour and is somewhat hot. In this portion, partial combustion takes place.

Innermost zone: It is black in colour and is coolest amongst all the zones.