'''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. | '''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. |