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And the path that I'm describing then, let's assume that we're raising the temperature up is this path right here.
经过一个，等压过程,路径就是这样。
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P dV is equal to R dT. pV = RT for 1 mole, pdV=RdT so I just take dV here.
对等压过程，那么。
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It was highly elevated above all other priorities and absort the lion share of effort and attention of the White House.
是压在所有其他首要任务之上的,在白宫人力物力方面,都占了很大的比重。
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Pulling this lever or pushing the button would actually rotate the paper enough so that you'd be on a new line and it would also move the little imprinting head that prints the letters of the alphabet and such all the way to the left.
拉杆或按下按钮会让纸翻一下,这样你就能在新的一行上打字了,同时移动打印字母的,压印头,这样也能移到最左边。
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There was the wonder I felt when I saw a brace of mountain like, spotted, black-and-white horses clopping down a dusty road through clouds of powdered clay.
我觉到很美妙,当我望见一大群如山般高大的，黑白斑点马压过土路,我觉到很快乐。
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And these electrodes are then connected to a variable voltage power supply.
这些电极然后,和一个变压电源连接起来了。
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If we want to know your blood pressure, you put on the cuff, you've got a measure.
如果想知道你的血压,把设备压在手腕处,就得到一个测量值
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Or what if the French come and squish us like grapes?
又或者,万一法国人打过来,把我们像葡萄一样压碎了又怎么办
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He presents himself, in other words, as a human being of unparalleled piety and devotion who will risk life itself rather than quit the post that has been given to him.
他呈现的自我，换句话说，是极度虔诚敬神的人类,甚至压下自己的生命作赌注,也不愿放弃这个天赐的角色。
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Why didn't the guys in the middle get crushed?
为什么中间的几排人没给压扁呢
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It's going to be pushed below costs.
产品价格会被压到成本以下
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They just pressed the lever.
它们只会去压动杠杆。
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My son,when he was in Seconde, which is the first year of French high school, they were out blocking traffic until some angry driver rolled over the foot of a protestor and then everybody kind of went off and ate pizza.
我的儿子,他高一,也就是法国高中的第一年,他们堵住交通,直到一个愤怒的司机压过一个抗议者的脚,他们才散开回去吃披萨
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Path number 2 on my diagram it's a reversible, this path number 2, it's a reversible constant pressure path.
路径，首先是一个，等压过程。
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Because we did work at constant pressure, and so it's just volume difference times pressure.
因为是在恒压下做功，所以功就等于体积变化乘以压力。
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This is just an equality. I have a constant pressure dH process. This term here is equal to zero.
这是一个等式，这是个恒压过程,这项等于零，这意味着。
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So, these two are equal to each other as well which tells me that this derivative, Cp dH/dT constant pressure is Cp.
所以这两者也相等,这告诉我们在恒压下微分，等于。
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It is taking place inside this thing, and it's a constant pressure, and we'll do it reversibly, right. So that's what we've got.
它是绝热的，在这个内反应,是在恒压下，它是可逆的，对吧？
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OK, so this, what I've sketched here would be a constant pressure calorimeter. There's a reaction.
好，我画的就是一个恒压量热计,其中进行一个反应。
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If you have an isobaric you're going to have to calculate where the energy changes, and that's a calculation that's likely on the homework and very like on an exam as well, too.
在等压过程中,我们需要计算能量的变化，我们在作业,和考试中,就会遇到这类问题。
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So the first path then, the first path, 1 constant volume constant V, so I'm going to, again, let's just worry about energy.
首先，是路径，等压过程。
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so that's what we think we know in constant pressure calorimetry.
好，我想这就是我们,在恒压量热法中所知道的。
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This depends on the path. It tells you right here the path is constant pressure. These don't depend on the path, right. V doesn't care how you v get there. u doesn't care how you get there.
这由变化的具体路径决定,这个小脚标表明过程是恒压的,这些量都与具体路径无关,即不管是通过什么路径使得体积变化为Δ
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STUDENT: Just a quick question on some of the constraints, like isothermal, isobaric, isovolumetric expansion.
学生：我有个关于,等温，等压，等容等约束条件的小问题。
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it's zero. Delta H1 is zero, right.
处于恒压下，它是零。
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So then, going from the initial to final states with a red path, ou start with an isobaric processand then you end with an isothermal process.
因此沿着,这条红色路径，你从一个等压过程开始,以一个等温过程结束。
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So, this path right here from this top red path is an isobaric process.
所以上面这条红色的路径,就是个等压过程。
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And our heat of reaction or enthalpy of reaction is defined as the enthalpy at constant pressure.
我们的反应热，或反映,的焓被定义为恒压，等温。
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It's going to take place in there. It's going to be a constant pressure, it might be open to the air, or even if it isn't, there might be plenty of room, and it's a liquid anyway, so the pressure isn't going to change significantly.
也许它是液体，它在这个位置,这是恒压的，它也许是连通大气的，就算不是，它也有，足够的空间，而它是液体,压强不会显著地改变。
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