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

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Coal

Ratio estimate

Energy; Coal

The ratio of two population aggregates (totals). For example, "average miles travelled per vehicle" is the ratio of total miles driven by all vehicles, over the total number of vehicles, within any ...

Specular reflectors

Energy; Coal

Specular reflectors have mirror like characteristics (the word "specular" is derived from the Greek word meaning mirror). The most common materials used for ballasts, the devices that turn on and ...

Unregulated entity

Energy; Coal

For the purpose of EIA's data collection efforts, entities that do not have a designated franchised service area and that do not file forms listed in the Code of Federal Regulations, Title 18, Part ...

Other load management

Energy; Coal

Demand-Side Management(DSM) programme other than Direct Load Control and Interruptible Load that limits or shifts peak load from on-peak to off-peak time periods. It includes technologies that ...

Ratoon crop

Energy; Coal

A crop cultivated from the shoots of a perennial plant.

Speculative resources (coal)

Energy; Coal

Undiscovered coal in beds that may occur either in known types of deposits in a favourable geologic setting where no discoveries have been made, or in deposits that remain to be recognized. ...