Char

"Fixed carbon" redirects here. For the biological process, see Carbon fixation.

For other uses, see Char (disambiguation).

Look up char in Wiktionary, the free dictionary.

Char is the solid material that remains after light gases (e.g. coal gas) and tar have been driven out or released from a carbonaceous material during the initial stage of combustion, which is known as carbonization, charring, devolatilization or pyrolysis.

Further stages of efficient combustion (with or without char deposits) are known as gasification reactions, ending quickly when the reversible gas phase of the water gas shift reaction is reached.

Coal

Coal types by grade (lowest to highest)	Peat¹ Lignite Sub-bituminous coal Bituminous coal Anthracite Graphite¹

Coal combustion	Black coal equivalent Char Clean coal Coal preparation plant Coal seam fire Coke Coal tar Energy value Flue gas Fly ash

Coal mining	Coalfields Coal dust Coal gas Coal slurry Coal homogenization Coal liquefaction Environmental impact of the coal industry History Mining regions Peak coal Refined coal Coal town

Note: [1] Peat is considered a precursor to coal. Graphite is only technically considered a coal type.

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Char

See also