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OK, so now let's try to formulate how to describe the equilibrium state and what dictates spontaneity.
现在我们尝试,找出如何描述平衡态以及,什么东西表明自发性。
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The equilibrium state is the one, and it's just one, in which there are no spontaneous changes that can take place to any other state.
平衡态是一个，而且仅仅是一个态，这个态不会发生自发变化,变成其他的态。
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What extracellular matrix you have in any particular tissue is there because there's a balance between it being produced by one kind of cell and digested by another, and you're in this sort of state of dynamic equilibrium.
特定组织中,细胞外基质的多少,取决于一个,分泌与降解的平衡,这是一种动态的平衡关系
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In the case here, tha t I just illustrated with the little cart going down the valley, would be exactly the same with regular energy, the equilibrium state is one of lowest energy, right.
在现在所考虑的情况下,我刚才所描述的小车沿着山谷下行，结论会像能量判据一样，平衡态是能量最低的态。
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That is, the chain, they could they could be approached with very little change from the equilibrium state.
这些态可以,通过平衡态,发生一些微小的变化得到。
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We're going to find other properties that do care about the history of the system like work, that you put in the system, or heat that you put in the system, or some other variables But you can't use those to define the equilibrium state.
我们还会发现其他一些,与系统的历史有关的性质,比如你对系统做的功，或者你向系统传递的热量，或其他的变量,但你不能用它们,来定义平衡态。
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Of course there are lots of states that would have maybe local pockets of one substance in excess and another substance in excess somewhere else In other words, there would be lots of states nearby to the equilibrium state.
当然，我们有很多的态,这些态中，某些位置被一种气体完全占据,另外一些位置被另一种气体完全占据,换句话说,在平衡态附近有很多的态。
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If I look at different points in my container during that path, I'm going to have to use a different value of pressure or different value of temperature That's not an equilibrium state, and that process turns out then to be an irreversible process.
如果我要研究在路径中容器里的,不同的点，我就得在容器里不同的点上使用,不同的压强值,或不同的温度值,实际上这不是个平衡态，这个过程是,不可逆过程。
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So the state variables describe the equilibrium's state and they don't care about how this state got to where it is.
状态变量,描述平衡态，它们并不关心,系统是如何演化成这样的。
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And now, what is this saying, the equilibrium state is the one with the lowest possible enthalpy.
这时，上面的结论表明,平衡态是自由焓最小的态。
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I've gone from 1 equilibrium state to another equilibrium state and the equal sign means you go from this state to that state.
从一个平衡态,过渡到了另一个平衡态,等号表示,从这个态到了那个态。
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So the point is, once you're at equilibrium none of the other states they're accessible, the system could rearrange itself to form them, but there is no accessible state that has higher entropy than the equilibrium state.
所以要点在于，如果你处于平衡态,其他所有的态都无法达到，我们可以重组体统来形成这些态，但没有一个可以达到的态,有比平衡态大的熵。
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In other words, what is the equilibrium state?
话句话说，哪个是平衡态？
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So that's a big help. And equilibrium happens when there isn't any possible change of state that would satisfy this.
这个非常方便，当所有的变化,都无法满足这个公式的时候,系统就达到了平衡。
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