In some sense, that's one reason to associate this as a kind of energy, H just like mechanical energy u or enthalpy H, it's the minimum free energy state that is the equilibrium state under the relevant conditions.
在某种意义下,这是我们把这些物理量称为能量的原因,就像机械能U和自由焓,具有最小自由能的状态在特定的条件下,就是平衡态。
Delta u, delta H, familiar state functions, q w changes in their values, q, w, heat and work.
U,△H,很熟悉的态函数,它们的值在变化;
Or, if we know the equation of state from a model, ideal gas, van der Waal's gas, whatever, u now we can determine u.
或者如果我们知道模型的状态方程,比如理想气体,范德瓦尔斯气体,无论什么,我们就可以利用状态方程得到内能。
Just like u, we'd like to be able to express it in a way that allows us to calculate what happens only from equation of state data.
就像内能u一样,我们希望能够利用状态方程的数据,计算出其表达式,这些表达式能方便我们说出即将发生的过程。
So what does that tell us about a state function like u?
所以这告诉我们的是,这过程中像u这样的态函数式怎么变化的?
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。
And it's more dramatic if the system is a gas p T2 V2 p, T2, V2, And let's look at what happens to U these functions of state, to H to u under this transformation.
如果是气体这个系统,就更具有趣了,让我们看看H和,在这个变化中态函数会发生什么变化。
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