氢元素是煤中第二重要的元素，主要存在于煤分子侧链和官能团上，随煤化程度的提高而呈下降趋势。煤中氢以符号Hdaf表示（过去用Hr）。是煤中有机质的主要组成元素。燃烧时，氢所产生的热量比碳高，约为碳的4.2倍。
研究结果证实，煤水平衡接触角首先受煤中氢、氧元素含量影响最大，其次与煤的灰分产率有很强的线性相关关系。
The research results showed that the contact angle of the coal water balance would be highly influenced by the hydrogen and oxygen contents of coal and had a hig…
研究结果证实，煤水平衡接触角首先受煤中氢、氧元素含量影响最大，其次与煤的灰分产率有很强的线性相关关系。
The research results showed that the contact Angle of the coal water balance would be highly influenced by the hydrogen and oxygen contents of coal and had a high lining rel...
千万年以来，人类的主要燃料是木头，燃烧木头的过程中，碳和氢的比率是10比1。相比较而言，煤在燃烧过程中这个比率是2比1，而石油的比率则是1比2。
Humanity's main fuel for eons was wood, which has a carbon-to-hydrogen ratio of 10 to 1 when burned; by comparison, that ratio is 2 to 1 for coal and 1 to 2 for oil.
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