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fuel |
Fuel is the class of Substances that can be used as resources in Combustion processes in order to produce heat. Mechanical energy can be produced by burning fuel in an Engine.
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petroleum product |
PetroleumProduct is a broad class that includes both crude oil (Petroleum) and RefinedPetroleumProducts.
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coal | Coal is a black or brownish black solid combustible substance formed by the partial decomposition of vegetable matter without free access of air and under the influence of moisture and often increased pressure and temperature. Coal is a sedimentary rock containing a high proportion of carbon. |
| | diesel fuel | DieselFuel is the subclass of RefinedPetroleumProducts that are fuels for diesel engines. |
| | gasoline | Gasoline is the subclass of RefinedPetroleumProducts that are fuels for internal combustion engines. |
| | liquefied petroleum gas | LiquefiedPetroleumGas is a compressed hydrocarbon gas. |