# First order phase transition (van der waals gas)

1. Apr 20, 2010

### jasony

I am looking at some of the notes but don't quite understand this.

What are the physical explanation of the graphs (Fig 4(a) and 4(b)) on Page 4 ?
http://www.pma.caltech.edu/~mcc/Ph127/b/Lecture3.pdf" [Broken]

Why $$V_{g}$$ decreases with temperature but $$V_{l}$$ increases with temperature?

Last edited by a moderator: May 4, 2017
2. Apr 22, 2010