Printable CO2 phase diagrams are available to show you the various carbon dioxide phases. Phase diagrams for a pure compound such as carbon dioxide are phase diagrams for a single component system. In these diagrams, pressure (P) and temperature (T) are usually the coordinates. The phase diagrams usually show the (P, T) conditions for stable phases.
Phase diagrams are useful for material engineering and material applications. The phase diagram of CO2 has some common features with water phase diagram: sublimation curve, vaporization curve, triple point, critical temperature and pressure. Of course, the P and T values of are unique to carbon dioxide. Take a look at the following CO2 phase diagrams and learn about the explanation below.
The triple point of carbon dioxide occure at a pressure of 5.2 atm (3952 torr) and 216.6 K (-56.4oC). At temperature of 197.5 K (-78.5oC), the vapor pressure of solid carbon dioxide is 1 atm (760 torr). At this pressure, the liquid phase is not stable, the solid simply sublimates. Thus solid carbon dioxide is called dry ice, because it does not go through a liquid state in its phase transition at room pressure. The critical temperature for carbon dioxide is 31.1°C, and the critical pressure is 73 atm. Above the critical temperature, the fluid is called super-critical fluid.
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