all combustible substances are not fuels .why ?
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All combustible substance are not fuel. ... Combustible substances are those which can burn.It is not necessary that they will produce a large amount of heat without leaving any residue on combustion. Hence all fuels are combustible but all combustible substances are not fuels.
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Combustible substances are those which can burn.It is not necessary that they will produce a large amount of heat without leaving any residue on combustion.Hence all fuels are combustible but all combustible substances are not fuels.There are certain characteristics of a good fuel such as it produces large amount of energy and does not leave any undesirable substances .Also it is cheap and readily available.
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