The outermost zone of a candle flame is known as its non luminous zone. Why?
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Explanation:
it also depends on a variety of factors like fuel, availability of air , etc...
outermost zone of a candle is non-luminous because complete burning takes place as it receives complete oxygen for burning , there is no residue left .
as candle made from petroleum which is a very flammable substance there should be complete burning in central zone there the flame flickers as enough O2 not present. it also happens in gas burner thats' why there is some spaces in b/t the holes of that
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