Ranking of soft coal generally having a heating value of 11,000-13,000 Btu/lb., high in volatile matter and ash.

Soft coal that yields pitch and tar and produces a large amount of smoke and ashes when it burns; containing volatile hydrocarbons.

A rank of coal that falls between anthracite and semi-bituminous. The most abundant rank of coal. Frequently referred to by the layman as "soft coal".

A rank of coal below anthracite, characterized by a high degree of conversion from the original plant matter and a high heat content per unit weight.

The most common type of coal with moisture content less than 20% by weight and heating value of 10,500 to 14,000 Btu per pound. It is dense and black and often has well-defined bands of bright and dull material.

a relatively soft dark brown to black coal, lower in fixed carbon than anthracite, but higher in volatile matter, hydrogen and oxygen

A shiny black coal that develops from deeply buried lignite through heat and pressure, and that has a carbon content of 80% to 93%, which makes it a more efficient heating fuel than lignite.

Coal that contains more than 14% volatile matter and has a calorific value of more than 11,500 BTU/lb.

the most abundant type of coal, which has a high heating value and usually a high sulfur content. Illinois coal is bituminous coal.

A coal which is high in carbonaceous matter, having between 15 and 50 percent volatile matter. Also known as soft coal.

see coal

A high-energy soft coal that ranks below anthracite in energy value. Generally has a high heat content and is soft enough to be readily ground for easy combustion. Bituminous accounts for the bulk of all coal mined in the United States.

A rank class of coals defined by the ASTM as having less than 86% fixed carbon, and more than 14% volatile matter and more than 10,500 Btu/lb on a moist, mineral-matter-free basis. An overlap of bituminous and subbituminous heat values from 10,500 to 11,500 Btu/lb is dependent on whether an agglomerate button with swelling characteristics is formed during volatile matter analysis. There are several divisions of bituminous coal. High-volatile C, B, and A are divided by increasing heat value. Medium and low-volatile bituminous coals are classified on the basis of increasing fixed carbon and decreasing volatile matter.

coal that contains more than 14 per cent volatile matter and that releases 11,400 BTU of energy per pound (26.7 MJ/kg) when burned. It is one of the higher ranks of coal and may be suitable for making steel.

also known as soft coal, it has several impurities which can be baked out to form coke; it is the type of coal most often used by blacksmiths

Bituminous coal is the most common coal. It is dense, black, often with well defined bands of bright and dull materials. Its moisture content usually is less than 20 percent. It is used for generating electricity, making coke, and space heating. The contents of subbituminous and bituminous coal range from 16 to 24 million Btu per ton and from 19 to 30 million Btu per ton, respectively.

The second hardest, most organically mature coal, ranking between sub-bituminous coal and anthracite

A dense coal, usually black, sometimes dark brown, often with well-defined bands of bright and dull material, used primarily as fuel in steam-electric power generation, with substantial quantities also used for heat and power applications in manufacturing and to make coke. Bituminous coal is the most abundant coal in active U.S. mining regions. Its moisture content usually is less than 20 percent. The heat content of bituminous coal ranges from 21 to 30 million Btu per ton on a moist, mineral-matter-free basis. The heat content of bituminous coal consumed in the United States averages 24 million Btu per ton, on the as-received basis (i.e., containing both inherent moisture and mineral matter).

Soft coal containing large amounts of carbon. It has a luminous flame and produces a great deal of smoke.

A middle rank coal (between subbituminous and anthracite) formed by additional pressure and heat on lignite. Usually has a high Btu value and may be referred to as "soft coal."

High-quality coal with a high percentage of pure carbon, low ash and low moisture content, and a heat content of approximately 26-70 GJ/tonne. Also called "soft coal". ASTM Coal classification by rank on a mineral matter free basis and with bed moisture only: low volatile Dry fixed carbon - at least 78% but less than 86%, dry volatile matter - 22% or less but more than 14%. medium volatile Dry fixed carbon - at least 69% but less than 78%, dry volatile matter - 31% or less but more than 22%. high volatile (A) Dry fixed carbon - less than 69%, dry volatile matter - more than 31%, moist Btu - 33 GJ/tonne or more. high volatile (B) Moist Btu - at least 30 GJ/tonne but less than 33 GJ/tonne.

A dense, black, soft coal, often with well-defined bands of bright and dull material. The most common coal, with moisture content usually less than 20 percent. Used for generating electricity, making coke, and space heating.

A coal rich in tarry hydrocarbons, burns easily. Can produce economical quantities of methane.

Bituminous coal is a relatively hard coal containing a tar-like substance called bitumen. It is of better quality than lignite coal but of poorer quality than anthracite coal.