Question

Some materials produce flame on burning while some not .why?

Answer 1

Substances like camphor, candles, etc., burn with flame while substances like coal do not produce flame on burning. Substances when burn produce heat and light. Some of them also produce flame with light. 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. This causes formation of visible flame. Flame color depends upon what is burning and how hot the object is.

Answer 2

the substances that vaporize burn with flame as these substances heat up like candles the rising c atom produces light . heat produces light which is known as incandescence this causes formation of visible frame, therefore the substances which do not vaporize burn without flame