等压“指压强不变。”
压强不变，体积变化。
So I need, well the pressure is constant, but there's a change in volume.
好只要压强不变，总压强不变，那么就应该用。
Well, as long as you keep the pressure, the total pressure, constant, Kx then you should be able to use Kx.
压强不变。
我们先继续考虑，保持熵不变的情况，即保持熵和压强不变。
Let's hang on for a little while longer to a set of conditions where we will maintain constant entropy, namely constant entropy and pressure.
在我们举的这个例子中，外界压强不变，气体体积改变。
This is an example where the external pressure here is kept fixed as the volume changes, but it doesn't have to be kept fixed.
我们同样可以看到如果保持自由焓,和压强不变熵的变化dS也是大于零的。
H We also saw that dS for constant H and p was greater than zero.
容易计算的路径，第一条路径，是首先保持压强不变,体积从V1压缩到。
I take V1 to V2 first, keeping the pressure constant at p1, then I take p1 to p2 keeping the volume constant V2 at V2. Let's call this path 1.
我们关心的大多数过程都是在保持压强、温度或体积不变的情况下发生的。
Most processes that we're concerned with will happen with something held constant like pressure or temperature or volume.
所以当遇到，压强改变系统的，总压强改变的问题时，这项是不变的。
So when we look at problems where we change the pressure, the total pressure of the system, this is going to stay the same.
从这个组分开始，保持组分不变，仅仅是减小压强，持续的减小压强。
I start in this composition. The composition doesn't change I'm just decreasing the pressure.
就是说，如果我们对,混合物的△,对压强求导，温度不变，当然，不是对压强的显函数。
That is, if we take the derivative G of delta G of mixing the partial derivative with respect to pressure, at constant temperature, of course, there's no explicit pressure dependence.
当我增加总压强的时候，这意味着我放入越来越多的惰性气体，的蒸汽压会如何变化？，which, way, is, this,going ？，它是增加，减少很是保持不变？
As I'm increasing the total pressure, meaning I'm putting more and more inert gas in there, a Is it going up, down, or staying the same?
如果我把装气体的容器放在桌子上，一小时以后我再回来时，气体的压强应该是不变的，否则它就不是平衡的。
If I place my container of gas on the table here, and I come back an hour later, the pressure needs to be the same when I come back Otherwise it's not equilibrium.
如果我把装气体的容器放在桌子上，一小时以后我再回来时，气体的压强应该是不变的，否则它就不是平衡的。
If I place my container of gas on the table here, and I come back an hour later, the pressure needs to be the same when I come back Otherwise it's not equilibrium.
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