Ontology

Overview / Open Energy Ontology / Class - lignite

Label: lignite

Definition:

Lignite is coal that is non-agglomerating with a gross calorific value less than 17 435 kJ/kg (4 165 kcal/kg) and greater than 31 % volatile matter on a dry mineral matter free basis.

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coal

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Definition:

Coal is a portion of matter consisting of combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams.