Question

which zone of candle flame is luminous and why​

Answer 1

Explanation:

The outermost zone: The outermost zone also known as non-luminous zone is the zone of complete combustion. The ample presence of oxygen (or air) aids in complete combustion. It is the hottest zone of the candle flame and does not produce much light. It is blue in colour.

Answer 2

Answer:

The outermost zone. The outermost zone also knowns as non - luminous zone is the Zone of complete combustion. This ample prensence of oxygen (or) aids in complete combustion. It is the hottest zone of candle flame and doesn't produce much light. It is blue in colour.