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

Light trucks

Energy; Coal

All single unit two-axle, four-tire trucks, including pickup trucks, sports utility vehicles, vans, motor homes, etc. This is the Department of Transportation definition. The Energy Information ...

Indicated resources, coal

Energy; Coal

Coal for which estimates of the rank, quality, and quantity are based partly on sample analyses and measurements and partly on reasonable geologic projections. Indicated resources are computed partly ...

Metropolitan statistical area (MSA)

Energy; Coal

A county or group of contiguous counties (towns and cities in New England) that has (1) atleast one city with 50,000 or more in habitants; or (2) an urbanised area of 50,000 inhabitants and a total ...

Indirect cost

Energy; Coal

Costs not directly related to mining or milling operations, such as overhead, insurance, security, office expenses, property taxes, and similar administrative expenses.

Humidifier

Energy; Coal

A humidifier adds moisture to the air(often needed in winter when indoor air is very dry). It may be a portable unit or attached to the heating system.

Measured heated area of residence

Energy; Coal

The floor area of the housing unit that is enclosed from the weather and heated. Basements are included whether or not they contain finished space.Garages are included if they have a wall in common ...