crude oil

crude oil
petroleum as it comes from the ground, before refining. Also called crude, crude petroleum.

* * *

▪ petroleum product
      mixture of comparatively volatile liquid hydrocarbons (compounds composed mainly of hydrogen and carbon with some nitrogen, sulfur, and oxygen) that occurs in the Earth's crust and is extracted for use as fuel and various petroleum products. Because crude oil is a mixture of widely varying constituents and proportions, its physical properties also vary widely. For example, the specific gravity, as measured on the American Petroleum Institute (API) gravity scale, may range from 10° to more than 60° and the colour from colourless to black. Crude oil occurs underground, at various pressures from tens to hundreds of kilograms per square centimetre, depending on the depth. Because of the pressure, it contains considerable natural gas in solution. The oil underground is much more fluid than it is on the surface, because the elevated temperatures there (on the average, the temperature rises 1° C for every 33 m [108 feet] of depth) decrease the viscosity.

* * *

Universalium. 2010.

Look at other dictionaries:

  • Crude Oil —    Oil produced from a reservoir after any associated gas has been removed.    ► See also Brent, WTI. * * * crude oil UK US noun [U] (also crude) ► NATURAL RESOURCES oil in a natural state that has not yet been treated: »The plant processes… …   Financial and business terms

  • crude oil — crude′ oil′ n. chem. petroleum as it comes from the ground, before refining …   From formal English to slang

  • Crude oil —   A mixture of hydrocarbons that exists in liquid phase in natural underground reservoirs and remains liquid at atmospheric pressure after passing through surface separating facilities. Depending upon the characteristics of the crude stream, it… …   Energy terms

  • crude oil — N UNCOUNT Crude oil is oil in its natural state before it has been processed or refined. A thousand tons of crude oil has spilled into the sea from an oil tanker …   English dictionary

  • Crude Oil — A naturally occurring, unrefined petroleum product composed of hydrocarbon deposits. Crude oil can be refined to produce usable products such as gasoline, diesel and various forms of petrochemicals. Although it is often called black gold, crude… …   Investment dictionary

  • crude oil — nafta statusas T sritis ekologija ir aplinkotyra apibrėžtis Žemės plutoje susidaręs degus aliejaus konsistencijos (paprastai tamsios spalvos, savito kvapo) skystis. Sudarytas iš įvairių angliavandenilių, deguonies, sieros ir azoto junginių. Iš… …   Ekologijos terminų aiškinamasis žodynas

  • crude oil — nafta statusas T sritis chemija apibrėžtis Gamtinis sočiųjų, nesočiųjų ir aromatinių (jų yra ir mažiau) angliavandenilių degusis mišinys su O, P, N junginių priemaišomis. atitikmenys: angl. crude oil; oil; petroleum rus. нефть …   Chemijos terminų aiškinamasis žodynas

  • crude oil — noun a dark oil consisting mainly of hydrocarbons • Syn: ↑petroleum, ↑crude, ↑rock oil, ↑fossil oil, ↑oil • Hypernyms: ↑oil, ↑fossil fuel • Hyp …   Useful english dictionary

  • crude oil — noun Unrefined oil; as it is found underground, consisting mainly of hydrocarbons Syn: crude, fossil oil, petroleum, rock oil See Also: syncrude …   Wiktionary

  • crude oil — Synonyms and related words: avgas, crude, ethyl, ethyl gas, fossil oil, gas, gasoline, high octane gas, high test, kerosene, lead free gas, low lead gas, motor oil, paraffin, petrol, petroleum, premium gas, regular, rock oil …   Moby Thesaurus

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”