The Phase Diagram for Water:

• Triple point (A), 0.0098 ^oC, 4.58 torr
• Normal melting point (B), 0 ^oC, 1 atm
• Normal boiling point (C), 100 ^oC, 1 atm
• Critical point (D), 374.4 ^oC, 217.7 atm

 
The Phase Diagram for Carbon Dioxide:

• Triple point (X), −56.4 ^oC, 5.11 atm
• Normal sublimation point (Y), −78.5 ^oC, 1 atm
• Critical point (Z), 31.1 ^oC, 73.0 atm
• Notice that CO₂ does not exist in the liquid phase at 1 atm of pressure.

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