Question

All combustible substances are not fuels. Why? (Short answers please)
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Answer 1

Hlo mate here is your answer.

A combustible substance is the one which can burn. It does notnecessarily mean that it would produce large amount of heat without leaving any residue. Thus all fuels arecombustible but not all combustible substances are fuels.

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Answer 2

Answer:

Explanation: combustible substances are those which can burn. It is not necessary that all fuels should be combustible. So all fuels are combustible but not all combustible things are fuels