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asphalt

asphalt (ăs´fôlt, –fălt), brownish-black substance used commonly in road making, roofing, and waterproofing. Chemically, it is a natural mixture of hydrocarbons. It varies in consistency from a solid to a semisolid, has great tenacity, melts when heated, and when ignited will burn with a smoky flame leaving very little or no ash. It is found in nature in deposits called asphalt lakes. Natural asphalt was probably formed by the evaporation of petroleum. Asphalt is obtained as a residue in the distillation or refining of petroleum. This is its important commercial source. It occurs also in asphalt rock, a natural mixture of asphalt with sand and limestone, which when crushed is used as road-building material. Asphalt is also used in the manufacture of paints and varnishes, giving an intensely black color.

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"asphalt." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/asphalt

"asphalt." The Columbia Encyclopedia, 6th ed.. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/asphalt

asphalt

as·phalt / ˈasfôlt/ • n. a mixture of dark bituminous pitch with sand or gravel, used for surfacing roads, flooring, roofing, etc. ∎  the pitch used in this mixture, sometimes found in natural deposits but usually made by the distillation of crude oil. • v. [tr.] cover with asphalt. DERIVATIVES: as·phal·tic / asˈfôltik/ adj.

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"asphalt." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt-0

"asphalt." The Oxford Pocket Dictionary of Current English. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt-0

asphalt

asphalt Brown or black, solid or semi-solid, bituminous substance made almost entirely of carbon and hydrogen. It melts between 65 and 95°C and is soluble in carbon disulphide. It is formed by the evaporation of volatile hydrocarbons and occurs in oilbearing rocks, e.g. in Trinidad, or as a residue from petroleum refining.

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"asphalt." A Dictionary of Earth Sciences. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." A Dictionary of Earth Sciences. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/asphalt

"asphalt." A Dictionary of Earth Sciences. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/asphalt

asphalt

asphalt Naturally occurring black or brown semi-solid bitumen, used mainly for road covering and roofing. Asphalt deposits occur in many parts of the world, including Trinidad, Venezuela, Alabama and Texas. Asphalt also occurs in petroleum, and is now mostly extracted in oil refineries.

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"asphalt." World Encyclopedia. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." World Encyclopedia. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/asphalt

"asphalt." World Encyclopedia. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/asphalt

asphalt

asphalt XIV. Early forms aspalt(oun), ult. — late L. asphalton, -um — Gr. ásphalton, -os; later asphalt(e) reproduces the F. asphalte.

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"asphalt." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt-1

"asphalt." The Concise Oxford Dictionary of English Etymology. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt-1

asphalt

asphalt •gestalt • asphalt •belt, Celt, dealt, dwelt, felt, gelt, knelt, melt, misdealt, pelt, Scheldt, smelt, spelt, svelte, veld, welt •fan belt • seat belt • lifebelt • sunbelt •rust belt • Copperbelt • heartfelt •underfelt • backveld • bushveld •Roosevelt •atilt, built, gilt, guilt, hilt, jilt, kilt, lilt, quilt, silt, spilt, stilt, tilt, upbuilt, wilt •Vanderbilt • volte •assault, Balt, exalt, fault, halt, malt, salt, smalt, vault •cobalt • stringhalt • basalt •somersault • polevault •bolt, colt, dolt, holt, jolt, moult (US molt), poult, smolt, volt •deadbolt • Humboldt • thunderbolt •megavolt • spoilt • Iseult •consult, cult, exult, indult, insult, penult, result, ult •adult • occult • tumult • catapult •difficult • Hasselt

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"asphalt." Oxford Dictionary of Rhymes. . Encyclopedia.com. 26 Apr. 2017 <http://www.encyclopedia.com>.

"asphalt." Oxford Dictionary of Rhymes. . Encyclopedia.com. (April 26, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt

"asphalt." Oxford Dictionary of Rhymes. . Retrieved April 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/asphalt