# Introduce the topic by playing a video micro-lecture

- Introduce the topic of phase diagrams withthe help of this video.
- Use the tool to first describe the phase diagram of water, and phase transformations of water at melting and boiling points, at various atmospheric pressures.
- Describe the phase diagram for carbon dioxide. Further, use the tool to explain the triple and critical points in a phase diagram and discuss the phase transitions at these points.
- Finally, introduce the term "supercritical fluid" and briefly describe its properties.

Play the video micro-lecture "Phase Diagrams" by Khan Academy, which

- introduces the topic of phase diagrams
- explains what phase diagrams depict by describing their different regions and degrees of freedom
- describes how to interpret phase diagrams under varying conditions of temperature and pressure

Use this video that describes the phase diagram of water, and phase transformations of water at melting and boiling points, at various atmospheric pressures.

Then explore the phase diagram for carbon dioxide.

- Further, use the tool to understand the triple and critical points in a phase diagram and discuss the phase transitions at these points.
- Finally, get introduced to the term "Supercritical fluid" and explore its properties.

Micro-lecture (video), 'Phase Diagrams' Presented by Sal Khan for Khan Academy