So our usual phase diagram here with temperature on this axis here and pressure on this axis here, and we've got our triplepoint sitting here.
我们通常的相图是这样，这个轴是温度轴，这个轴是压强轴，这里是三相点。
2
It's a very common thing to get, the triplepoint from this.
从这里得到三相点是非常常见的。
3
Then if I change to the triplepoint, where the number of phases is three, then the number of degrees of freedom 2 is one minus three is minus two, two plus two is zero.