Phase diagram for CO2


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Introduction

CO2 can exists as a gas, liquid, or solid. At standard temperature and pressure (STP), CO2 exists as a gas. At the tripple point (5.11 atm , -56.4 oCelsius) all phases exist in equilibrium. At the critical point (31.1°C, 73 atm - located upper right in the phase diagram for CO2), the temperature and pressure at which the liquid and gaseous phases of a pure stable substance become identical.

Fig. Phase diagram for CO2

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