The triple point of CO₂ is at 5.2 atm and -57°C. Under atmospheric conditions present in a typical Boulder, Colorado, laboratory (P = 630 torr, T = 23°C), solid CO₂ will

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The triple point of a substance is the point at which all three phases (solid, liquid, and gas) coexist in equilibrium. Therefore, if the conditions are not at the triple point, the substance will either melt (if the conditions are at a lower pressure and higher temperature than the triple point) or sublime (if the conditions are at a lower pressure and lower temperature than the triple point). In this case, the atmospheric conditions in the Boulder laboratory are at a lower pressure and higher temperature than the triple point, so the solid CO₂ will sublime.

The Triple Point of CO2 Is at 5

The Triple Point of CO₂ Is at 5