Phase Change.

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Presentation transcript:

Phase Change

Phases of Matter The properties of solids, liquids, and gases differ. How does matter change state? Solid Liquid Gas

Energy of Phase Internal energy can be stored as bonds between atoms and molecules. Solids have the strongest bonds Energy required to break them to a liquid

Filling the Volume Unlike a liquid, gas fills the whole volume. Atoms are free to move. Volume depends on pressure and temperature. liquid gas

Phase Diagrams For each temperature and pressure a material is in a specific state. The triple point is uniquely defined for each material. P3 for water is used to define the Kelvin The critical point is where there is no difference between liquid and gas. Phase diagram for water

Sublimation At low pressures a solid can go directly to a gas and vice versa. This process is called sublimation. Dry ice to gaseous carbon dioxide Water vapor to frost There is a latent heat of sublimation Phase diagram for carbon dioxide

Partial Pressure

Dalton’s Law

Relative Humidity

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