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

btu

Energy; Coal

Known as British thermal unit, it's the amount of energy needed to increase the temperature of one pound of water by one degree Fahrenheit.

bug dust

Energy; Coal

Small particles released by boring or drilling in the mine.

bump (or burst)

Energy; Coal

An intense energy release by the rock around the working or face area that is caused by stress.

cage

Energy; Coal

Refers to the elevator that is used in a mine to transport materials and people.

calorific value

Energy; Coal

The amount of heat in BTU's that is release by burning one pound of coal.

cannel coal

Energy; Coal

Can also be called candle coal, it has a high percentage of hydrogen. It is easy to ignite, burns with a bright yellow flame and leaves behind very little ash. It was a used as a light source in ...