介绍理想气体、理想气体混合物、真实气体、真实气体混合物的有效能计算方法，并以硫酸工业中常见气体为例加以说明。
The calculation methods for available energy of perfect gases and their mixture, and true gases and their mixture are discussed with the example of gases common in sulphuric acid industry.
当我们有一个混合物时，我们从理想气体开始讨论。
When we have a mixture, and we're going to start with ideal gases.
顺便说一下，它很简便，因为它看起来就像理想气体，混合物中化学势的表达式。
By the way, it's convenient because it looks just like the chemical potential in a mixture of ideal gases.
那么如果我们有理想气体，当然如果我们设想，理想液体混合物，我们就能放心地，假设上面是理想气体。
So if we have an ideal gas, and certainly if we're going to assume an ideal liquid mixture, we can safely assume that it's an ideal gas above it.
那么如果我们有理想气体，当然如果我们设想，理想液体混合物，我们就能放心地，假设上面是理想气体。
So if we have an ideal gas, and certainly if we're going to assume an ideal liquid mixture, we can safely assume that it's an ideal gas above it.
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