We have to make all South Africans that people living with H.I.V.

VOA: special.2010.04.28

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

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

So instead of being equal to negative z squared, now we're equal to negative z effective squared times r h all over n squared.

这里不再等于-z的平方，现在我们等于-有效的z的平方,乘以RH除以n的平方。

麻省理工公开课 - 化学原理课程节选

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

We are going to take the sum of the delta H's delta H or the deltas H for all of these little reactions.

我们将会把这些H加和,也就是所有这些过程的。

麻省理工公开课 - 固态化学导论课程节选

Edgar Lee Masters They are Dreiser, Edgar Lee Masters Lewis H.L. Mencken, Anderson, and Lewis: all American writers. Compare that with the catalog that he gives of his reading on 249, and you'll see what's being elided.

有德莱塞,门肯，Anderson和：,对比一下,他在249页讲的那类作家，你们会发现他隐去了一些内容。

耶鲁公开课 - 1945年后的美国小说课程节选

All right, so if we think about b h bond here, again, it's the sigma bond, and we're going to say it's a boron 2 s p 2 hybrid orbital interacting with a hydrogen 1 s orbital.

这可以告诉我们，为什么它倾向于周围只有6个电子，好了，考虑一下这里的BH键,同样的，它是sigma键,我们说。

麻省理工公开课 - 化学原理课程节选

So here, I'm going to have delta H, is just the sum for all the products of delta heat of formation right? Here I'm going to put together all the products. So this is a positive heat of formation.

所以这里△H就是所有生成物的,生成热的和,对吧？这里,我要把元素组合成所有这些,生成物，所以这里是正的生成热。

麻省理工公开课 - 热力学与动力学课程节选

This is why people right tables and tables of H delta H's. Why you have delta H's from all these reactions, because this is basically the heat and the heat is something we can measure, we can control. We can figure out how much heat is going in and out of something.

这就是为什么人们一再提出ΔH的原因,为什么在所有的反应中你都能看到Δ,因为它就是热量，而且热量,是一种我们可以测量并且控制的东西，我们可以测量出有多少热量,从一些东西里面放出或被吸收。

麻省理工公开课 - 热力学与动力学课程节选