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If you travel by bus in Sao Paulo,Brazil these days your vehicle may be powered by hydrogen fuel cells.
VOA: special.2009.09.07
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I'm going to write it like this three moles of hydrogen which is a gas one bar 100 degrees Celsius.
我会写成这样：,三摩尔氢分子，气体,1巴，100摄氏度。
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Let's look at the energetics of one of those electrons crashing into a hydrogen atom inside the gas tube.
我们一起来考察一下,其中的一个电子的能量,在阴极射线管中,撞击到氢原子上。
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It contains forms of hydrogen and oxygen that can mark, or label, these elements within body water.
VOA: special.2011.07.27
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HBr So for example, if I want to look at HBr there's a simple case, right, hydrogen bromine.
如果我想研究,这是个简单的例子，溴化氢。
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One shows the remains of a dying star four thousand light years away which has thrown off a cloud of glowing hydrogen gas.
VOA: special.2009.09.30
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So what we can actually directly compare is the dissociation energy or the bond strength of nitrogen versus hydrogen.
因此实际上我们可以直接进行比较,对氮分子与氢分子的离解能,或键的强度。
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The bus uses a hybrid system that combines the hydrogen fuel cells with high power batteries.
VOA: special.2009.09.07
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There's not actually chemical covalent bonds that are formed but it's a non-covalent interaction, usually dominated by hydrogen bonding.
所以配体和受体之间不生成共价键,这是一种非共价化合反应,它们通常以氢键相联
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But not everyone sees the hydrogen fuel cell bus as the hope of the future.
VOA: special.2009.09.07
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And, if we wanted to try to fit, say, hydrogen, into this scheme that we have, we have to do what?
如果我们想要让他们符合我们的原理比如氢气，我们需要怎样？
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Mister Zundt says a hydrogen bus will last an average of twenty years, while a diesel bus can be used for five to eight years.
VOA: special.2009.09.07
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But it is interesting. Let's just, for an order of magnitude say what happens for ground state electron in atomic hydrogen?
但行星模型其实挺有趣的，按照重要的先后顺序，我们来猜想一下,氢原子中的基态电子会发生些什么？
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The city's urban transportation system recently launched the first of up to five hydrogen buses.
VOA: special.2009.09.07
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And, even Cavendish, one of the things that he observed was that hydrogen could be combusted to produce water vapor.
甚至卡文迪许都观察到了,氢气燃烧,会产生水蒸气。
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The action of oil and natural gas created hydrogen sulfide in the limestone.
VOA: special.2009.12.07
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If we take hydrogen peroxide in the liquid state, it can break down to form water and oxygen.
如果我们有一些液态的过氧化氢，它会分解成水和氧气。
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He regretted that work was being done to develop the hydrogen bomb.
VOA: special.2009.06.14
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So in addition to having these two carbon bonds, we actually also have four carbon hydrogen bonds in addition to our carbon-carbon bonds.
在这碳碳之间的键以外，我们还有四个碳氢键,除了我们的碳碳键外。
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Hydroxyl is the combination of one hydrogen atom and one oxygen atom.
VOA: special.2009.09.30
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It is a double column, You can see, it starts with hydrogen and goes to mercury in ascending order of atomic mass.
双纵栏，你们看到，从氢开始,然后到水银，按原子质量的升序排列。
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The project hopes to export hydrogen fuel cell buses in the future.
VOA: special.2009.09.07
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In contrast, the dissociation energy of a bond for hydrogen, and molecular hydrogen is everywhere around us, we see 432 kilojoules per mole.
相反，氢分子在我们周围到处都是，一个氢分子的离解能，是432千焦每摩尔。
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The hydrogen sulfide reacted with oxygen in rainwater moving through the rock.
VOA: special.2011.04.11
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So if I tell you that the energy for single hydrogen atom is negative 13 12 kilojoules per mole.
如果我告诉大家单个氢原子的能量,是负的，1312，千焦每摩尔。
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Water is made of one oxygen atom and two hydrogen atoms.
VOA: special.2009.09.30
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I mean, you would expect that the group one, absent hydrogen, would be the ones that would have the least.
我想，你们可能认为第一主族，没有氢，而氢应该是最小的。
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They both worried about the possible use of a hydrogen bomb.
VOA: special.2009.06.14
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He has two electrons here with the same set of quantum numbers. B but these are two separate hydrogen atoms.
因为我写了两个量子数,一样的电子,但这是在两个不同原子中啊。
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In the early 1850s, Angstrom, up at the University of Uppsala in Sweden was conducting experiments on atomic hydrogen.
在19世纪50年代的头几年，阿姆斯特朗，那时还在瑞典的乌普萨拉大学里,做了一个有关氢原子的实验。
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