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

Amorphous silicon

Energy; Coal

An alloy of silica and hydrogen, with a disordered, noncrystalline internal atomic arrangement, that can be deposited in thin-film layers (a few micrometres in thickness) by a number of deposition ...

Active power

Energy; Coal

The component of electric power that performs work, typically measured in kilowatts (kW) or megawatts(MW). Also known as "real power." The terms "active" or "real" are used to modify the base term ...

Average vehicle fuel consumption

Energy; Coal

A ratio estimate defined as total gallons of fuel consumed by all vehicles divided by (1) the total number of vehicles (for average fuel consumption per vehicle) or (2) the total number of households ...

Active solar

Energy; Coal

As an energy source, energy from the sun collected and stored using mechanical pumps or fans to circulate heat-laden fluids or air between solar collectors and a building.

Average vehicle miles travelled

Energy; Coal

A ratio estimate defined as total miles travelled by all vehicles, divided by: (1) the total number of vehicles (for average miles travelled per vehicle) or (2) the total number of households (for ...

Actual peak reduction

Energy; Coal

The actual reduction in annual peak load (measured in kilowatts) achieved by customers that participate in a utility demand-side management (DSM) program. It reflects the changes in the demand for ...

Average water conditions

Energy; Coal

The amount and distribution of precipitation within a drainage basin and the run off conditions present as determined by reviewing the area water supply records over a long period of time.