classification of coal

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• Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …   Wikipedia

• coal — coalless, adj. /kohl/, n. 1. a black or dark brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. Cf. anthracite, bituminous coal, lignite. 2. a piece of glowing, charred, or burned wood or other… …   Universalium

• coal — n a brown to black combustible sedimentary rock (in the geological sense) composed principally of consolidated and chemically altered plant remains. DISCUSSION Conditions required for formation of coal are believed to include accumulation of… …   Coke&Coal Terminology

• Coal producing districts —   A classification of coal fields defined in the Bituminous Coal Act of 1937. The districts were originally established to aid in formulating minimum prices of bituminous and subbituminous coal and lignite. Because much statistical information… …   Energy terms

• Coal Tit — Adult British Coal Tit, P. a. britannicus (note greenish grey back) Conservation status …   Wikipedia

• Coal Skink — Conservation status Least Concern (IUCN 3.1) …   Wikipedia

• Coal Run (novel) — Coal Run   Author(s) Tawni O’Dell Countr …   Wikipedia

• Coal-crested Finch — Conservation status Near Threatened (IUCN 3.1) Scientific classification K …   Wikipedia

• Coal Classification —   In the United States, coals are classified by rank progressively from lignite (least carbonaceous) to anthracite (most carbonaceous) based on the proximate analyses of various properties (fixed carbon, volatile matter, heating value, and… …   Energy terms

• coal classification — ▪ process  any of various ways in which coal is grouped. Most classifications are based on the results of chemical analyses and physical tests, but some are more empirical in nature. Coal classifications are important because they provide… …   Universalium

• coal utilization — Introduction        combustion of coal or its conversion into useful solid, gaseous, and liquid products. By far the most important use of coal is in combustion, mainly to provide heat to the boilers of electric power plants. Metallurgical coke… …   Universalium