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material such as coal, gas, or oil that is burned to produce heat or power.
EX:petrol,diesel etc
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its not just abou burning
Image result for fuelpetrolheadkenya.com
Fuel gas is any one of a number of fuels that under ordinary conditions are gaseous. Many fuel gases are composed of hydrocarbons (such as methane or propane), hydrogen, carbon monoxide, or mixtures thereof.
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Any material that produce/liberate heat on burning is termed as fuel.
That heat is then used in different purposes like, igniting vehicle engine, cooking food, etc.
Fuel are coal, petroleum(gasoline, diesel , etc).
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um, its not only burning
burning is not incrooect. but its not the only way in which energy can be ectracted from a fuel
yes u are right
but i have written that all fuel liberate heat on burning
and u are saying way to extract energy is part of that
Thats what I am saying, ALL fuels do not liberate heat only on BURNING.. and thats only how you extract energy from it.. heat energy can either be extracted by burning of the examples that you provided.. or else there are fuels that dont need to be burned to produce heat..  for example nuclear fuel that need to under go fission and not combustion.
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