Question

Give answer in brief. 1. Why do some materials burn with flame while others without 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.

Answer 2

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.