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Phase Diagrams
A phase diagram shows the conditions at which the
distinct phases of matter can occur at equilibrium.
Phase Diagram
Melting


Freezing           Vaporization

              Condensation




Deposition

Sublimation
Phase Diagrams
         Triple Point
                        The triple point of a
                        substance is the
          Liquid        temperature and
                        pressure at which
 Solid
                        gas, liquid, and solid
                        coexist in
           Gas
                        thermodynamic
                        equilibrium.
Phase Diagrams
         Triple Point
                        For water, the
                        combination of
          Liquid        pressure and
                        temperature are
 Solid
                        exactly 0.010000 C
                        and 0.0060373 atm.
           Gas
                        At that point, the
                        liquid can boil and
                        freeze at the same
                        time.
Phase Diagram
        According to the red line on the phase diagram,
if we apply enough pressure to ice, it will melt into liquid water.




                             What are the practical
                                applications?
Phase Diagram
        According to the red line on the phase diagram,
if we apply enough pressure to ice, it will melt into liquid water.
                       Ice Skating is one application
                            of this phenomenon.
Phase Diagrams
     Carbon dioxide




Dry Ice
Phase Diagrams
                                     Carbon dioxide has
                                     a vapor pressure of
                                     830 psi (56.5 atm)
                                     at 20 C.



 Dry Ice




At 0 C the pressure inside a CO2 fire extinguisher is
    about 500 psi. At 30 C it is about 1000 psi.
Phase Diagrams
      Carbon

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Phase diagram notes

  • 1. Phase Diagrams A phase diagram shows the conditions at which the distinct phases of matter can occur at equilibrium.
  • 2. Phase Diagram Melting Freezing Vaporization Condensation Deposition Sublimation
  • 3. Phase Diagrams Triple Point The triple point of a substance is the Liquid temperature and pressure at which Solid gas, liquid, and solid coexist in Gas thermodynamic equilibrium.
  • 4. Phase Diagrams Triple Point For water, the combination of Liquid pressure and temperature are Solid exactly 0.010000 C and 0.0060373 atm. Gas At that point, the liquid can boil and freeze at the same time.
  • 5. Phase Diagram According to the red line on the phase diagram, if we apply enough pressure to ice, it will melt into liquid water. What are the practical applications?
  • 6. Phase Diagram According to the red line on the phase diagram, if we apply enough pressure to ice, it will melt into liquid water. Ice Skating is one application of this phenomenon.
  • 7. Phase Diagrams Carbon dioxide Dry Ice
  • 8. Phase Diagrams Carbon dioxide has a vapor pressure of 830 psi (56.5 atm) at 20 C. Dry Ice At 0 C the pressure inside a CO2 fire extinguisher is about 500 psi. At 30 C it is about 1000 psi.
  • 9. Phase Diagrams Carbon