1. Question Can water boil at room temperature?

2. How do We Interpret Phase Diagrams?

3. Lets recall Gas phase Liquid phase Solid phase

4. What is a Phase Diagram? A phase diagram shows the preferred physical states of matter at different temperatures and pressure. There exists for each gas a temperature above which the gas cannot be liquefied. This temperature, above which the gas cannot be liquefied, is called the critical temperature Triple point is the intersection on a phase diagram where three phases coexist in equilibrium

5. Trying to Interpret a Phase Diagram What is happening along curve AB? What is happening along curve BC? What is happening along curve BD?

6. Phase Change Terms We must know the names of the phase changes. Which ones do we know already?

7. How do we identify the phases?

8. Lets interpret the diagrams?