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So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.
他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。
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So, these on-changing properties that describe the state of the equilibrium state of the system are called state variables.
这些描述,系统平衡态的,变化的属性,就叫做状态变量。
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It's a switch that from outside can be used to change the life of a cell.
这种来自外源的变化能够改变细胞的状态
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This is really a general idea in psychology that we are in a way wired up to be more sensitive to change than to steady states.
这是心理学上一个普遍的观点,某种意义上,比起稳定状态，我们对变化更敏感。
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Often, for a particular state change, it is easy to calculate two of these, but not the third.
对于一些特定的状态变化，它们中的两个很好计算，但是第三个往往不容易计算。
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Certainly in principle we know how to calculate this and other stuff for a change in state of this sort, for lots of changes of state.
的确原则上我们可以对某个状态变化,计算这些物理量,或者其他物理量，对其他的变化也可以做相同的计算。
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But now, what happens if, instead we look at what happens when we go to some state one to some other state two and it's the pressure. Or the volume, that changes.
但是现在，我们看看如果,我们关系从状态一变化到状态二时,体积或者压强发生变化。
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That's a reversible path.
注：即变化过程中气体的任何状态。
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And the useful outcome of all that is that p we get to see how entropy changes with one of those variables in terms of only V, T, and p, which come out of some equation of state.
这样做的重要结果是,我们得到了熵随着V，T或者,其中一个变量变化的情况，这些可以从状态方程得到。
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