why do all substance not produce flame on burning??
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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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When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.
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