There's the water phase, there's the ice cube is the solid phase, and there's some water, gas, vapor, and that's one bar.

里面放一块冰，这是固态；,于是我们得到了水，冰和水蒸气三态共存的点。

麻省理工公开课 - 热力学与动力学课程节选

And you can find these compressibility factors in tables. If you want to know the compressibility factors for water, for steam, at a certain pressure and temperature, you go to a table and you find it.

各种气体的压缩系数,想知道水或者水蒸气,在某个温度和压强下的，压缩系数，查表就行了，这是实际气体状态方程的。

麻省理工公开课 - 热力学与动力学课程节选