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

Masonry

Energy; Coal

A general term covering wall construction using masonry materials such as brick, concrete block, stone, and tile that are set in mortar; also included is stucco. The category does not include ...

Kyoto protocol

Energy; Coal

The result of negotiations at the third Conference of the Parties (COP-3) in Kyoto, Japan, in December of1997. The Kyoto Protocol sets binding greenhouse gas emissions targets for countries that sign ...

High-temperature collector

Energy; Coal

A solar thermal collector designed to operate at a temperature of 180 degrees Fahrenheit or higher.

Masonry stove

Energy; Coal

A type of heating appliance similar to a fireplace, but much more efficient and clean burning. They are made of masonry and have long channels through which combustion gases give up their heat to the ...

Manufacturing division

Energy; Coal

One of 10 fields of economic activity defined by the Standard Industrial Classification Manual. The manufacturing division includes all establishments engaged in the mechanical or chemical ...

Junction

Energy; Coal

A region of transition between semiconductor layers, such as a p/n junction, which goes from a region that has a high concentration of acceptors (p-type) to one that has ahigh concentration of donors ...

Heavy rail

Energy; Coal

An electric railway with the capacity for a "heavy volume" of traffic and characterised by exclusive rights-of-way, multi-car trains, high speed and rapid acceleration, sophisticated signaling, and ...