(1) That's called the dew line.

(2) STUDENT: Between the dew line and the bubble line?

(3) So when I reach the dew line, I start forming liquid.

(4) We mix the bubble line and the dew line together.

(5) The other one was called the bubble line, this is called the dew line.

(6) And the bubble line. Sometimes, instead of having a nice separation between the bubble and the dew line, there's a special point which for some reason those two curves meet. Non-ideality.

(7) It's got a bubble line on top, and the dew line on the bottom.