无论采用容积法还是重量法测量吸附平衡，准确计算气相氢密度对于实验结果的可靠性是至关重要的。
Accurate determination of the gas phase density is very important for the reliability of adsorption measurements in both volumetric and gravimetric methods.
到那时纯镁可用作燃料(其能量密度大约是氢的十倍)。
The pure magnesium can then be used as a fuel (its energy density is about ten times that of hydrogen).
或许，如果找到办法可以容易地存储高密度氢气的话，那么氢能源会东山再起。
Maybe, too, the hydrogen economy will rear its head again-but only if a way can be found of storing the gas easily and at high density.
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