Question

Why some substances burn with a flame while some burn without a flame?

Answer 1

Answer:

Substances like camphor, candles, etc., burn with flame while substances like coal do not produce flame on burning. The substances which vaporize during burning produces flame. As these substances heat up, like candles, the rising C-atoms produce light. Heat produces light, which is known as incandescence.

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Answer 2

Answer:

The combustible substances like wax, which vaporize on burning produce flames. And those combustible substances which do not get vaporize on burning do not produce flame. ... Secondly on burning if carbon present in substance burn completely, flame is produced due to reaction of oxygen with carbon

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