Why materials burn and what happen when something start burning and what is the purpose of burning materials?

Answer 1

materials burn because of a chemical reaction that occured within the material. as for the purpose there can be many... you can burn wood for warmth or a candle because it smells good

Answer 2

Materials burn due to a chemical reaction with oxygen, releasing heat and light in the process. When something starts burning, it undergoes combustion, breaking down into simpler compounds and releasing energy in the form of heat and light. The purpose of burning materials can vary, such as for generating heat, producing light, or as a means of disposing waste.