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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Contributors in 石炭
Coal
条件付きのエネルギー強度
エネルギー; 石炭
エネルギー源(s)または燃料(s)を使用する建物の総床面積で割った特定のエネルギー源(s)または燃料(s)の総消費量、すなわち、エネルギー源固有の床面積の消費量の比率。 ...