Definition of Coal tar. Meaning of Coal tar. Synonyms of Coal tar

Here you will find one or more explanations in English for the word Coal tar. Also in the bottom left of the page several parts of wikipedia pages related to the word Coal tar and, of course, Coal tar synonyms and on the right images related to the word Coal tar.

Definition of Coal tar

Coal tar
Tar Tar, n. [OE. terre, tarre, AS. teru, teoru; akin to D. teer, G. teer, theer, Icel. tjara, Sw. tj["a]ra, Dan. ti[ae]re, and to E. tree. [root]63. See Tree.] A thick, black, viscous liquid obtained by the distillation of wood, coal, etc., and having a varied composition according to the temperature and material employed in obtaining it. Coal tar. See in the Vocabulary. Mineral tar (Min.), a kind of soft native bitumen. Tar board, a strong quality of millboard made from junk and old tarred rope. --Knight. Tar water. (a) A cold infusion of tar in water, used as a medicine. (b) The ammoniacal water of gas works. Wood tar, tar obtained from wood. It is usually obtained by the distillation of the wood of the pine, spruce, or fir, and is used in varnishes, cements, and to render ropes, oakum, etc., impervious to water.
Coal tar
Coal Coal, n. [AS. col; akin to D. kool, OHG. chol, cholo, G. kohle, Icel. kol, pl., Sw. kol, Dan. kul; cf. Skr. jval to burn. Cf. Kiln, Collier.] 1. A thoroughly charred, and extinguished or still ignited, fragment from wood or other combustible substance; charcoal. 2. (Min.) A black, or brownish black, solid, combustible substance, dug from beds or veins in the earth to be used for fuel, and consisting, like charcoal, mainly of carbon, but more compact, and often affording, when heated, a large amount of volatile matter. Note: This word is often used adjectively, or as the first part of self-explaining compounds; as, coal-black; coal formation; coal scuttle; coal ship. etc. Note: In England the plural coals is used, for the broken mineral coal burned in grates, etc.; as, to put coals on the fire. In the United States the singular in a collective sense is the customary usage; as, a hod of coal. Age of coal plants. See Age of Acrogens, under Acrogen. Anthracite or Glance coal. See Anthracite. Bituminous coal. See under Bituminous. Blind coal. See under Blind. Brown coal, or Lignite. See Lignite. Caking coal, a bituminous coal, which softens and becomes pasty or semi-viscid when heated. On increasing the heat, the volatile products are driven off, and a coherent, grayish black, cellular mass of coke is left. Cannel coal, a very compact bituminous coal, of fine texture and dull luster. See Cannel coal. Coal bed (Geol.), a layer or stratum of mineral coal. Coal breaker, a structure including machines and machinery adapted for crushing, cleansing, and assorting coal. Coal field (Geol.), a region in which deposits of coal occur. Such regions have often a basinlike structure, and are hence called coal basins. See Basin. Coal gas, a variety of carbureted hydrogen, procured from bituminous coal, used in lighting streets, houses, etc., and for cooking and heating. Coal heaver, a man employed in carrying coal, and esp. in putting it in, and discharging it from, ships. Coal measures. (Geol.) (a) Strata of coal with the attendant rocks. (b) A subdivision of the carboniferous formation, between the millstone grit below and the Permian formation above, and including nearly all the workable coal beds of the world. Coal oil, a general name for mineral oils; petroleum. Coal plant (Geol.), one of the remains or impressions of plants found in the strata of the coal formation. Coal tar. See in the Vocabulary. To haul over the coals, to call to account; to scold or censure. [Colloq.] Wood coal. See Lignite.

Meaning of Coal tar from wikipedia

- Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It is a type of creosote. It has both medical and...
- The two main kinds recognized in industry are coal-tar creosote and wood-tar creosote. The coal-tar variety, having stronger and more toxic properties...
- through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. Mineral products resembling tar can be produced from fossil hydrocarbons...
- Created by William Valentine Wright in 1860, Wright's Coal Tar Soap is a British brand of antiseptic soap designed to cleanse the skin thoroughly. It is...
- 1850s by Ludwig Mond, was producer gas made from coal instead of coke. It contained ammonia and coal tar and was processed to recover these valuable compounds...
- from coal or petroleum. The term was in use by the late 18th century for oil produced as a by-product of the production of coal gas and coal tar. In the...
- chemical industry with a wide range of artificial dyes being made from coal gas and coal tar. Facilities where the gas was produced were often known as a manufactured...
- source of the benzene from which they are derived was coal tar, aniline dyes are also called coal tar dyes. In aniline, the C−N bond length is 1.41 Å, compared...
- polymer which can be natural or manufactured, derived from petroleum, coal tar, or plants. Pitch produced from petroleum may be called bitumen or asphalt...
- decomposes organic substances in the coal, driving off water and other volatile and liquid products such as coal gas and coal tar. Coke is the non-volatile residue...