洗煤比重計算
煙煤密度0.8~1g/cm3,煙煤粉密度0.4~0.7g/cm3,無煙煤(幹、小)密度0.7~1.0g/cm3, 無煙煤粉密度0.84~0.89 g/cm3,褐煤密度0.6~0.8 g/cm3