This chemistry video tutorial explains the concepts behind the phase diagram of CO2 / Carbon Dioxide and the phase diagram of water / H2O. This video contains plenty of examples and practice problems:

Chemistry Textbook:
https://amzn.to/30wWZOH

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Here is a list of topics:
1. Phase Changes
2. Freezing - Liquid to Solid
3. Melting - Solid to Liquid
4. Vaporization - Liquid to Gas
5. Condensation - Gas to Liquid
6. Sublimation - Solid to Gas
7. Deposition - Gas to Solid
8. Phase Diagram of CO2 - Carbon Dioxide - Sublimation
9. Melting Point Curve vs Boiling Point Curve
10. Normal Atmospheric Pressure of 1 Atm
11. Definition of Normal Melting Point and Normal Boiling Point
12. Solid, Liquid, and Gas Phases
13. Critical Point, Critical Temperature, and Critical Pressure
14. Supercritical Fluids -
15. Density of Solids vs Liquids for CO2
16. Why ice is less dense that water
17. Melting Point Curve - Negative Slope for H2O vs Positive Slope for CO2 - Density & Pressure