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asphalt	a sticky brown to black bituminous substance, occurring naturally or obtained as a by-product of refining petroleum and coal tar, and used for paving, roofing, and waterproofing. [1/4 definitions]
benzene	a colorless, volatile, flammable liquid, obtained from petroleum and coal tar and used in or to make a wide variety of chemical products, such as insecticides, motor fuels, and solvents.
bitumen	any of various natural substances composed chiefly of hydrocarbons, or such substances distilled from petroleum and coal, used for paving and waterproofing.
butyl alcohol	any of four isomeric alcohols with three carbon molecules, obtained from petroleum products and used in organic synthesis or as solvents.
carbon	a chemical element that has six protons in each nucleus and that occurs in pure forms as diamond and graphite, or in a large variety of compounds such as carbon dioxide, carbohydrates, and petroleum hydrocarbons. (symbol: C) [1/7 definitions]
carbon black	any of various finely divided forms of carbon obtained from the incomplete burning of natural gas or petroleum oil, and used to make ink, pigments, and rubber, and as a filtering agent.
cracking	the process of breaking down heavier hydrocarbons into lighter ones by heat, pressure, or catalysts, as in distilling petroleum to make gasoline. [1/3 definitions]
crude	unrefined petroleum; crude oil. [1/7 definitions]
crude oil	petroleum that comes directly from under the ground and has not been refined.
energy	power or heat from sources such as the sun, wind, petroleum, natural gas, or coal that can be put to use by humans. [1/4 definitions]
fossil fuel	any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuels.
fuel oil	any oil used for fuel, esp. a liquid petroleum product.
gasoline	a volatile, flammable liquid of hydrocarbons, derived from petroleum and used primarily as fuel for internal-combustion engines.
heptane	a flammable hydrocarbon distilled from petroleum and used in products such as fuels and solvents.
hydrogen	a chemical element that contains one proton in each nucleus and that occurs naturally in many compounds such as water, acids, petroleum hydrocarbons, and carbohydrates, and in pure form as a highly flammable, lighter-than-air gas used in many industrial applications, such as the hydrogenation of fats and oils. (symbol: H) (Cf. deuterium, protium, tritium.)
kerosene	a thin liquid fuel obtained by distilling petroleum, coal shale, or the like.
ligroin	a flammable solvent made by distilling petroleum.
LPG	abbreviation of "liquefied petroleum gas."
mineral oil	an oil derived from petroleum, used in cosmetics and as a laxative. [2 definitions]
naphtha	a colorless, flammable liquid distilled from coal or petroleum and used mainly as a solvent and cleaning agent.
naphthalene	a white, crystalline hydrocarbon compound obtained from coal tar or petroleum and used in making moth repellents, dyes, solvents, and other products.

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