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e methane or paraffin series. They are colorless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule.

See Petrology.

A combining form from Gr. rock, stone; as, petrology, petroglyphic.

iption of rocks; that department of science which investigates the constitution of rocks; petrology.

Transportation, as of petroleum oil, by means of a pipe conduit; also, the charge for such transportation.

A line of pipe with pumping machinery and apparatus for conveying liquids, esp. petroleum, between distant points.

he consistence of tar, and of a strong smell. It is inflammable, and intermediate between petroleum and asphalt. [Written also pisasphaltum, pisasphalt, etc.]

gaseous hydrocarbon, C3H8, of the paraffin series, occurring naturally dissolved in crude petroleum, and also made artificially; -- called also propyl hydride.

ns intermediate between gsolene and cymogene. It is obtained in the purification of crude petroleum, and is used as a refregerant.

nder Agaric. -- Rock moss, a kind of lichen; the cudbear. See Cudbear. -- Rock oil. See Petroleum. -- Rock parrakeet (Zoöl.), a small Australian parrakeet (Euphema petrophila), which nests in holes among the rocks of high cliffs. Its general color is yellowish olive green; a frontal band and the outer edge of the wi…

like of the Five Nations. Seneca grass(Bot.), holy grass. See under Holy. -- Seneca eil, petroleum or naphtha. -- Seneca root, or Seneca snakeroot (Bot.), the rootstock of an American species of milkworth (Polygala Senega) having an aromatic but bitter taste. It is often used medicinally as an expectorant and diureti…

Impure dark-colored sulphuric acid that has been used in the refining of petroleum.

ly oxidized that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium)…

dden action; as, to strike off what is superfluous or corrupt. -- To strike oil, to find petroleum when boring for it; figuratively, to make a lucky hit financially. [Slang, U.S.] -- To strike one luck, to shake hands with one and wish good luck. [Obs.] Beau. & Fl. -- To strike out. (a) To produce by collision; to fo…

nitroglycerin. It is also used in etching iron, in removing iron scale from forgings, in petroleum refining, etc., and in general its manufacture is the most important and fundamental of all the chemical industries. Formerly called vitriolic acid, and now popularly vitriol, and oil of vitriol. -- Fuming sulphuric aci…

hydrocarbon, C13H28, of the methane series, which is a probable ingredient both of crude petroleum and of kerosene, and is produced artificially as a light colorless liquid.

bon, C13H26, of the ethylene series, corresponding to tridecane, and obtained from Burmah petroleum as a light colorless liquid; -- called also tridecylene, and tridecene.

A liquid hydrocarbon, C11H24, of the methane series, found in petroleum; -- so called from its containing eleven carbon atoms in the molecule.

stance, almost odorless and tasteless, obtained as a residue in the purification of crude petroleum, and consisting essentially of a mixture of several of the higher members of the paraffin series. It is used as an unguent, and for various purposes in the arts. See the Note under Petrolatum. [Written also vaselin.]…