Hard Coal
Hard Coal : Road Transport. 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 30OC and relative air humidity of 96 per cent, and with a mean random reflectance of vitrinite of at least 0.6.
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