Question

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what is fuel?​

Answer 1

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A fuel is any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work. ... The heat energy released by reactions of fuels is converted into mechanical energy via a heat engine.

Answer 2

A fuel is a material that can be made to react with other substances so that it releases energy as heat energy or to be used for work. The heat energy released by reactions of fuels is converted into mechanical energy via a heat engine.