Question

which is the luminous zone of the candle and why it is called luminous zone?

Answer 1

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Here's your respected answer-

The middle zone is the luminous zone of the candle. This is luminous as incomplete combustion takes place in this zone because of insufficient supply of oxygen which releases​ unburnt carbon particles which burns and produce light because of partial combustion.

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Answer 2

The yellowish orange part .as it produces light by burning the sunburnt carbon party Chan les