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Definition: Hard coal


A black, natural fossil organic sediment with a gross calorific value of more than 23 860 kJ/kg (5 700 kcal/kg) in the ash-free condition and with the moisture content obtaining at a temperature of 30° C and relative air humidity of 96 per cent, and with a mean random reflectance of vitrinite of at least 0.6.

This definition is identical in the third and fourth version of the Transport Glossary. Eurostat, ECMT, UN/ECE, "Glossary for Transport Statistics", 3rd Edition, Luxembourg 2003
International Transport Forum, Eurostat, United Nations Economic Commission for Europe (UNECE), "Illustrated Glossary for Transport Statistics", 4th Edition, Luxembourg 2009