Question

what are fuels??????​

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.

Answer 2

Answer ⤵️

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. ... Hydrocarbons and related oxygen-containing molecules are by far the most common source of fuel used by humans, but other substances, including radioactive metals, are also utilized.