Phase Changes
Learning Objectives
- Students will be able to identify and name the six phase transitions
- Students will be able to explain what happens to particle arrangement during phase changes
- Students will be able to interpret heating curves showing phase changes
Core Concepts
- melting
- freezing
- evaporation
- condensation
- sublimation
- deposition
- latent_heat
Formulas
$$Q = mL$$
Heat energy for phase changes (L is latent heat, either of fusion or vaporization)
Units
| latent heat of fusion | L_f (J/kg) |
| latent heat of vaporization | L_v (J/kg) |
Interesting Fact
Frost forming directly from water vapor on cold surfaces is deposition, the reverse of sublimation
Key Scientist
James Thomson
Discovered regelation and the effect of pressure on melting points
Modern Research
Phase diagrams guide materials science and engineering; understanding phase transitions is crucial for refrigeration and thermal management.
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