在所有的气体中氢是最轻的。

Of all gases hydrogen is the highest.

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夏普博士说如果月球岩石中氢的初始含量接近地面的岩石，氯同位素比例比率不会这么分散。

Dr Sharp said that if lunar rocks had initial hydrogen contents anywhere close to those of terrestrial rocks, the chlorine isotope ratios would not have so much scatter.

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在另一项演示中，他们为华盛顿大学分析了细菌中的制氢过程。

In another demonstration, they analyzed hydrogen production in bacteria for the University of Washington.

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So what that means is that's how much energy we would have to put into a hydrogen molecule in order to get it to split apart into its two atoms.

它的意义,就是我们需要向一个氢分子中注入这么大的能量,才能将它分解成两个独立的原子。

麻省理工公开课 - 化学原理课程节选

So, why don't you go ahead and tell me, keeping that in mind, which atom in terms of h c or n would you expect to be in the center of hydrogen cyanide?

那么，请大家来告诉我，并且记住它，你认为氢，碳和氮中哪个原子,应该在氰化氢的中间呢？

麻省理工公开课 - 化学原理课程节选

This is the homonuclear bond energy for hydrogen in pure hydrogen. There we have perfect covalency.

这是氢的同原子的共价能,在纯氢中，我们有完美的共价键。

麻省理工公开课 - 固态化学导论课程节选