So it helps us predict, will we see this, for example, h 2, which we're going to be about to do, we'll see is stabilized because it has more bonding than anti-bonding.

这帮助我们预测，我们等会会看到，比如H2O，我们等会要讲到，我们会看到它更稳定是,因为成键比反键更多。

麻省理工公开课 - 化学原理课程节选

So it has a bond, there's no bond in h e 2.

所以在He2里没有键。

麻省理工公开课 - 化学原理课程节选

And the bigger lesson from that is that entropy, unlike energy u or enthalpy H, we could define an absolutely number for it.

热力学第三定律的一个更重要的推论是,与内能和自由焓不同，我们可以给上定义一个绝对的数值。

麻省理工公开课 - 热力学与动力学课程节选

stdio h It pretty much means open this file, standard IO dot H and just paste its contents right here.

它的大致上的意思是打开这个文件,然后把它的内容粘贴在那里。

哈佛公开课 - 计算机科学课程节选

H And, by the way, if you do this for the hydrogen, H it ought to come out the same.

顺便说一句，如果是，或者如果是。

麻省理工公开课 - 固态化学导论课程节选

But how do we get to 1861 and that secession crisis with Alexander H. Stephens delivering this Cornerstone Speech, declaring that, "Hey folks, it's all about slavery and its preservation?"

但事情怎么会演变到1861年那样,乃至之后的分离危机,亚历山大为何能在这篇演讲中,宣称,"嘿,伙计们,今天我要讲的是奴隶制和对其保护"

耶鲁公开课 - 美国内战与重建课程节选

It turns out after you do all the math, H it turns out to be delta H equals zero.

要等你做完所有的计算之后，才能知道结果，结果证明Δ

麻省理工公开课 - 热力学与动力学课程节选

we know that h is always terminal, right after the molecule that it's attached to.

我们知道氢原子永远都在末端，放到和它成键的分子的后面。

麻省理工公开课 - 化学原理课程节选

So, for example, down here I wrote that it was n 2 and that it was h 2, but when I re-wrote the molecules up here, you saw that it's an h h single bond where it's a nitrogen-nitrogen triple bond.

比如，在这下面我写的是氮分子2,而这个是氢分子，但我在上面把这些分子的形式改写了，大家可以看到,这是一个氢与氢之间的单键，含一个氮与氮之间的三键。

麻省理工公开课 - 化学原理课程节选

In a .h file, it's generally the names of functions other people wrote.

在头文件里,只有一些函数名。

哈佛公开课 - 计算机科学课程节选

And there you have it. There is the H right there.

，就得到了这个等式。

麻省理工公开课 - 热力学与动力学课程节选

And h with the carrot or the hat here, well, that carrot or hat tell us it must be an operator, and this is called the Hamiltonian operator.

而且带帽的H，好，这个帽告诉我们它肯定是一个算符，这个被称为哈密顿算符。

麻省理工公开课 - 化学原理课程节选

Now, you know with constant volume, H now it's not going to be delta H that's U straightforward to measure, it's going to be dealt u, all right.

好，现在你们知道在体积恒定的条件下，我们得到的不是Δ,我们直接测量到的是Δ,好，但这基本上也是一样的。

麻省理工公开课 - 热力学与动力学课程节选

We somehow have to take hydrogen, attach it to carbon, and we have to make it symmetric, and we have to make it nonpolar.

我们需要把H接到C周围，而且我们需要让它是对称，且非极性的。

麻省理工公开课 - 固态化学导论课程节选

It's delta H of formation of the products minus delta H of formation of the reactants.

反应的△H是多少？,它就是生成物的生成焓减。

麻省理工公开课 - 热力学与动力学课程节选

stdio c So somewhere there's standard IO dot C, stdio h somewhere they're standard IO dot H, but, for me, right now, the only file I need to know about is the dot H, -- because what Sharp include really does -- it's what's called a preprocessor directive.

所以某个地方有一个，现在对于我来说它们是，我只要知道那个，h文件，因为Sharp包含的-,叫做预处理指令。

哈佛公开课 - 计算机科学课程节选

The bond, it turns out, 5° is 104 . 5 degrees, that h o h bond.

这个键即，ＨＯＨ键角，是104。

麻省理工公开课 - 化学原理课程节选

So if you picture, for example, b h 3, it's going to look like this.

如何使键劲量相互远离，我们会有平面三角形的情形，如果你想象。

麻省理工公开课 - 化学原理课程节选

So, if we take h 2, and we want to draw the electron configuration, it's very short.

如果我们取h2，我们要画电子构型，这很简单。

麻省理工公开课 - 化学原理课程节选

So if you're working with cyanide in the lab as potassium cyanide or sodium cyanide, those are what are called p h s's, it's a rating for different kinds of chemicals.

因此如果你在实验室中,需要用到氰化物，比如氰化钾或者氰化钠，这就是所谓的，“P，H，S“,这是化学药品有害程度的一个级别。

麻省理工公开课 - 化学原理课程节选

Adiabatic q equal to zero. It's also delta H 0 which is zero. The two didn't necessarily follow because remember, delta H is dq so p is only true for a reversible constant pressure process.

在这个过程中ΔH等于,绝热的所以q等于0，而ΔH也等于,这两个也不一定有因果关系,因为，记住，ΔH等于dq只有在恒压。

麻省理工公开课 - 热力学与动力学课程节选