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This is delta minus and this is delta plus.
这边是负电，这边是正电。
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You can use delta minus, delta plus.
你可以用△+，△
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U OK, so let's look at delta u. Delta u is q plus w.
好的，让我们看看Δ
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u=q+w All right, what is delta u? delta u is q plus w.
好，Δu是多少？Δ
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OK, delta H is delta of u plus pV. By definition that's how we define enthalpy up here.
好，ΔH=Δ,根据定义，这就是我们。
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q Work is zero. Delta u is w plus q, work plus heat. This is zero, this isn't.
功是零，△U是w加，功加上热量，这个是零。
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RT So it's delta u plus RT, we can say T1 is the n temperature we've used here, delta n of the gas.
所以它应该是ΔU加,我们可以在这里用T1，气体的Δ
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Step three to four isothermal compression, w2 delta u is going to be q2 plus w2.
第三步，到四点的等温压缩，Δu等于q2加。
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So what happens then we're going to use the ideal gas law. So it's approximately delta u plus delta nRT. That's a constant. That's a constant.
我们现在要应用理想气体物态方程,这个近似等于ΔU加上Δ,这是常数，这是常数。
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H=qp The u plus p V. Delta H is equal to q V.
括号里面的就是H，等于u+pv，Δ
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U And then if we can also determine delta u, then we know this, we know delta u is q plus w w, then we can determine work as well, right?
然后，如果我们也能定出△,然后我们知道这个,我们知道△U等于q加？
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And of course, in either case, w delta u is q plus w, so it's q irreversible plus w irreversible, u being a state function it's the same in either case.
当然了，在这两个过程中，Δu都等于q加，因此现在是q不可逆加w不可逆，同时u在这两个过程中都是态函数。
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Delta u is q plus w. Delta u isn't zero.
U是q+w，△U不是零。
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PV So I have minus delta pV plus delta pV.
所以我把负ΔPV加上Δ
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V Minus p2, V2. Minus p delta V. So the total work is the work from the left hand side plus the work on the right hand side, p1 V1- p2 V2 which is p1 V1 minus p2 V2.
负p2V2【w=-p2v2】，即负pΔ,所以全部的功就是,左边的功加上右边的功，等于。
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