Question

Match the following for the flame of a candle.

Answer 1

$\bullet$ The outermost zone is also known as the non-luminous zone. It is the hottest among all the zones and has a temperature of approximately ${1400}^{\circ }\text{C}$. The colour of the outermost zone is blue due to the complete combustion of wax as there is a sufficient supply of air around it.

$\bullet$ The middle zone is also known as the luminous zone. It is less hot than the outermost zone and has a temperature of approximately ${1200}^{\circ }\text{C}$. The colour of the middle zone is yellow due to the incomplete combustion of wax as there is an insufficient supply of air in this zone.

$\bullet$ The innermost zone is also known as the dark zone.
It is the least hot among all the zones and has a temperature of approximately ${600}^{\circ }\text{C}$. The innermost zone is black in colour and contains unburnt wax vapours.

$\begin{array}{ccc}\text{Column A}& \text{Column B}& \text{Column C}\\ \text{(a) Hottest part}& \text{Outer zone of complete combustion}& \text{Blue}\\ \text{(b) Moderately hot}& \text{Middle zone of partial combustion}& \text{Yellow}\\ \text{(c) Least hot}& \text{Innermost zone of unburnt wax vapours}& \text{Black}\end{array}$