Answer: When a combustible substance burns, a chemical reaction occurs in which the substance (fuel) combines with oxygen, and gives off heat, gases, and often light (flames). ... However, oxidizing materials can supply combustible substances with oxygen and support a fire even when air is not present.
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Answer:
Answer: When a combustible substance burns, a chemical reaction occurs in which the substance (fuel) combines with oxygen, and gives off heat, gases, and often light (flames). ... However, oxidizing materials can supply combustible substances with oxygen and support a fire even when air is not present.