1. Phases and Phase Changes

2. The Phases Solid Liquid Gas Plasma ColdestHottest

3. Properties of Phases PhaseAre the molecules rigid, or do they flow? Is the shape indeterminate (flows) or defined (stuck)? Solid RigidDefined Liquid, Gas, and Plasma FlowIndeterminate

4. Phase Changes

6. (Boiling and Evaporation)

7. Phase Changes

9. Energy during a Phase Change Example) Water Freezes (liquid to solid) at 0 o C Stays constant at 0 o C during freezing

10. Energy during a Phase Change Example) Water Melts (solid to liquid) at 0 o C Stays constant at 0 o C during melting

11. Energy during a Phase Change Example) Water Boils (liquid to gas) at 100 o C Stays constant at 100 o C during boiling

12. Phase Changes In summary: During a phase change, the temperature is CONSTANT!!!