Phase Changes

1
Phase Changes

• Changes of state (solid, liquid gas)
• A change of state involves a change in potential
  energy

2
Freezing / Melting Point

• The temperature at which the solid and liquid
  form of a substance exist in equilibrium.

3
Vaporization

• The change of state from liquid to gas.

4
Evaporation

• When molecules of a liquid escape from the
  surface of the liquid and enter the vapor (gas)
  phase.

5
Vapor

• the gaseous state of a substance that is normally
  a liquid or solid at room temperature.

6
Vapor Pressure

• pressure exerted by a vapor over its liquid.

7
Boiling Point

• Temperature at which the vapor pressure of a
  liquid equals the atmospheric pressure.

8
Condensation

• The change of state from gas to liquid.

9
Sublimation

• Conversion of a solid directly into a gas.

10
Deposition

• Conversion of a gas directly into a solid.

11
Heating Curve

• Plot of the temperature as energy changes over
  time.

12
Heating Curve

• energy

13
Phase Diagram

• Graph of the phases of a substance at specific
  temperatures and pressures.

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Triple Point

• the pressure and temperature at which all three
  phases coexist.

17
Tm Tb
101.325 kPa TP Tc
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Normal

• Means at standard pressure.