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

Shortwall mining machine

Energy; Coal

Underground mining equipment. Generally a continuous-mining machine used with a powered, self-advancing roof support system. It shears coal froma short coal face (up to about 150 feet long). The ...

Operating day

Energy; Coal

A normal business day. Days when a company conducts business due to emergencies or other unexpected events are not included.

Radiative forcing

Energy; Coal

A change in average net radiation at the top of the troposphere (known as the tropopause) because of a change in either incoming solar or exiting infrared radiation. A positive radiative forcing ...

Sodium silicate

Energy; Coal

A grey-white powder soluble in alkali and water, insoluble in alcohol and acid. Used to fireproof textiles, in petroleum refining and corrugated paperboard manufacture, and as an egg preservative. ...

Shuttle car

Energy; Coal

Underground mining equipment. A rubber-tired haulage vehicle that is unloaded by a built-in conveyor.

Operating expenses

Energy; Coal

Segment expenses related both to revenue from sales to un affiliated customers and revenue from intersegment sales or transfers, excluding loss on disposition of property, plant, and equipment; ...

Radiatively active gases

Energy; Coal

Gases that absorb incoming solar radiation or outgoing infrared radiation, affecting the vertical temperature profile of the atmosphere. Also see Radiative forcing.