- Physical Chemistry I
Spring 2013, Unique 52575
Lecture Summary, 25 February 2013
|Phase transitions: A few definitions:
Phase: a form of matter that is uniform in its chemical and physical composition. That does not mean it has to be pure, just homogeneous.
Phase transition: the conversion of one phase to another, which occurs at characteristic temperatures and pressures and which can be expressed on a phase diagram.
Phase diagram: plot of pressure (y-axis) vs. temperature (x-axis) that shows regions of thermodynamic space at which various phases are stable. Phase transitions occur at the boundaries between two stable phases.
We drew a couple generic phase diagrams and definied some interesting characteristics, such as the triple point and the critical point. There are many examples of phase diagrams in your text book.