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'''Fuel''' traditionally is a substance that may be burned to produce [[energy]] (heat, light, or power). In more recent times fuelds can also be [[nuclear]], and these do not require burning to produce energy. The chief property of fuel is its caloric value - the amount of heat produced by complete combustion of a unit mass of its volume.
Some fuels that have been found and used throughout history include [[wood]], animal and vegetable oil, [[peat]], [[coal]], and dried dung.
Common fuels today are [[petroleum]] and [[natural gas]].
Many fuels also have a number of incombustibles, such as ash, that could cause air pollution and have unhealthy or even toxic qualities from fuel production.
==Sources==
The New American Desk Encyclopedia, Penguin Group, 1989
[[Category:Energy]]
Some fuels that have been found and used throughout history include [[wood]], animal and vegetable oil, [[peat]], [[coal]], and dried dung.
Common fuels today are [[petroleum]] and [[natural gas]].
Many fuels also have a number of incombustibles, such as ash, that could cause air pollution and have unhealthy or even toxic qualities from fuel production.
==Sources==
The New American Desk Encyclopedia, Penguin Group, 1989
[[Category:Energy]]