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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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and crashed onto all of the stuff in the bedroom.
然后砸下来，压在卧室里所有的东西上。
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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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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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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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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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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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You just change volume to pressure and basically you're looking at enthalpy under a constant -- anything that's done at a constant volume path with energy, there's the same thing happening under constant pressure path for enthalpy.
可以看到这就是把体积换成了压强,一般我们都是在一种恒定状态下,考虑焓的，任何在恒容条件下,能伴随能量变化的东西，也在恒压条件下伴随焓同样地变化,所以你可以经常。
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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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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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Could be done, but easier is to just do the whole thing at constant volume, right, and just run the reaction that way and redo the calculation to be a constant volume rather than constant pressure calorimeter, right.
可以进行测量,但是如果在体积恒定的条件下,做这些会容易得多,还是这样进行反应,但是在等体而不是恒压条件下重新计算。
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T So we know that T dS/dT at constant volume is Cv over T, T and dS/dT at constant pressure is Cp, over T.
在恒定压强下定压比热容Cp乘以dT除以,所以在恒定体积下dS/dT等于Cv除以，在恒定压强下dS/dT等于Cp除以。
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We already did that. OK, dH/dT constant pressure is Cp. That was easy one.
我们已经做过这个计算了，好的，在恒压,状态下的偏H偏T就是Cp，这个很简单。
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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。
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dT That means that dH is also equal to dH/dT, constant pressure dT. All right, so now I've T ot more dH/dT under constant pressure.
也等于偏H偏T恒压乘以，现在我已经得到了在恒压,状态下的偏H偏。
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Our vehicles sink into wet roads and crush dry roads because they are too big and heavy.
我们的车子因为笨重,陷入泥路中，在干道路上被压碎。
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Let's label that two. It's still at constant pressure.
我们把这个标为II，它仍然是在恒压下。
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The constraint isn't constant temperature because the temperature is going to be changing.
是在不停变化的，不是恒压,因为我们已经有Δp了。
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T Remember, we're trying to get delta H, p we're trying to get dH/dT constant pressure and dH/dp constant temperature. OK, these are the two things were trying to get here.
想要得到在恒压状态下的偏H偏，和在恒温状态下的偏H偏,好的，这是两个我们，在这里想要得到的东西。
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