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Phase Changes

Phase Changes. Where is this used?. Conditioning of buildings, such as 'ice-storage' Cooling of heat and electrical engines Cooling: food, beverages, coffee, wine, milk products, green houses Medical applications: transportation of blood, operating tables, hot-cold therapies

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Phase Changes

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  1. Phase Changes

  2. Where is this used? • Conditioning of buildings, such as 'ice-storage' • Cooling of heat and electrical engines • Cooling: food, beverages, coffee, wine, milk products, green houses • Medical applications: transportation of blood, operating tables, hot-cold therapies • Waste heat recovery • Solar power plants • Spacecraft thermal systems • Thermal comfort in vehicles • Thermal protection of electronic devices • Thermal protection of food: transport, hotel trade, ice-cream, etc. • Textiles used in clothing • Computer cooling

  3. Review: 3 Phases of Matter • Solid • Liquid • Gas

  4. What happens during a phase change? • During a phase change, heat energy is either absorbed or released. • Heat energy is released as molecules slow down and move closer together. • Heat energy is absorbed as molecules speed up and expand.

  5. Types of Phase Changes • Types of Phase Changes

  6. Melting • Phase change from a solid to a liquid • Molecules speed up, move farther apart, and absorb heat energy

  7. Freezing • Phase Change from a liquid to a solid • Molecule slow down, move closer together and release heat energy.

  8. Vaporization (Boiling) • Phase change from a liquid to gas. It occurs at the boiling point of matter. • Molecules speed up, move farther apart, and absorb heat energy.

  9. Evaporation • Phase change from a liquid to a gas on the surface of a liquid (occurs at all temperatures). • Molecules speed up, move farther apart, and absorb heat energy.

  10. Condensation • Phase change from a gas to a liquid. • Molecule slow down, move closer together and release heat energy.

  11. Sublimation • Phase change from a solid to a gas. • Molecules speed up, move farther apart, and absorb heat energy.

  12. Deposition • Phase change from a gas to a solid. • Molecules slow down, move closer together and release heat energy.

  13. Graphing a Phase Change

  14. What is wrong with this picture?

  15. Melting & Boiling Points • Melting Point: The temperature at which a solid changes into a liquid. • Boiling Point: The temperature at which a liquid changes into a gas. • What is a Freezing point? Compare the freezing and melting points of water.

  16. Summary

  17. Why is there no change in temperature during a phase change? Define melting and boiling points. What is the melting point and boiling point of water? At what temperature does water freeze and become a solid? Graphing a Phase Change

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