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

Independent system operator (ISO)

Energy; Coal

An independent, Federally regulated entity established to coordinate regional transmission in a non-discriminatory manner and ensure the safety and reliability of the electric system.

Indian coal lease

Energy; Coal

A lease granted to amining company to produce coal from Indian lands in exchange for royalties and other revenues; obtained by direct negotiation with Indian tribal authorities, but subject to ...

Metropolitan area

Energy; Coal

A geographic area that is a metropolitan statistical area or a consolidated metropolitan statistical area as defined by the U.S. Office of Management and Budget.

Microgroove

Energy; Coal

A small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.

Indirect utility cost

Energy; Coal

A utility cost that may not be meaning fully identified with any particular DSM programme category. Indirect costs could be attributable to one of several accounting cost categories (i.e., ...

Micrometre (or micron)

Energy; Coal

One-millionth of a meter. It can also be expressed as 10-6 meter.

Light rail

Energy; Coal

An electric railway with a "light volume" traffic capacity compared to "heavy rail." Light rail may use exclusive or shared rights-of-way, high or low platform loading, and multi-car trains or single ...