Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

Add a new term

Contributors in Coal

Become a Contributors

Coal

bituminen kivihiili

Energy; Coal

Pehmeän hiilen, joka pidetään parempi ruskohiilen mutta pahin kuin antrasiitti. On noin 60-80 % hiiltä loput veteen, ilmaan, vety ja rikkiä.

musta kostealla

Energy; Coal

Termi kun alueella on alhainen happipitoisuus ja liikaa typen, argonin, hiilidioksidin tai vesihöyryä. Kaivos, tämä luo tappava tilanteessa, jossa tukehtuminen on yhteinen.