Phase Change Diagrams

Pressure and Temperature

• Triple point- point at which the solid, liquid and vapor states that all have the same vapor pressure coexist
• Critical temperature- the temperature above which the vapor cannot be liquefied regardless of the pressure applied
• Critical pressure- the pressure required to liquefy the vapor at the critical temperature
• Critical point- point at which the critical temperature and critical pressure coincide

Temperaure

 Helpful links:

• Phase diagrams
• Phase diagrams video