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Fire is a chemical reaction that releases heat and light. It occurs when a fuel reacts with oxygen, and the reaction is sustained by the release of heat. The fuel can be anything that contains carbon and hydrogen, such as wood, paper, or gasoline. When the fuel is heated, it breaks down into smaller molecules that can react with oxygen. The oxygen atoms in the air combine with the carbon and hydrogen atoms in the fuel to form carbon dioxide and water vapor. This reaction releases heat and light, which keeps the fire going.