What is the meaning of triple point?

What is the triple point for carbon dioxide?

This message has been edited. Last edited by: DorianGreyed,

The lowest pressure at which liquid CO2 exists is at the triple point, namely 5.11 atm at ­56.6°C.

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The triple point of a material occurs when the vapor, liquid and solid phases are all in equilibrium. This is the point on a phase diagram where the solid-vapor, solid-liquid and liquid-vapor equilibrium lines all meet.

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Originally posted by frankvan:
The triple point of a material occurs when the vapor, liquid and solid phases are all in equilibrium. This is the point on a phase diagram where the solid-vapor, solid-liquid and liquid-vapor equilibrium lines all meet.

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I concur with frankvan's description of triple point.

Click here or any number of other references to find that the triple point for CO₂ is -56.6^o Celsius (-69.9^o Farenheit).