Some materials burn with flame whereas others burn without a flame why?
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The chemical process in which a substance reacts with oxygen to give off heat is called combustion. Substances that undergo combustion are called combustible substances. It may be a solid, liquid or gas. Along with heat, some produce flame or glow. The substances which vaporize during burning give flames. For example combustion of kerosene oil produces flame. On the other hand certain substances like coal do not vaporize and hence doesn’t produce a flame.
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