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Do Now!

Do Now!. Can you continue with the questions you were doing last lesson (Expansion) ?. Today’s lesson. Describe qualitatively the thermal expansion of solids, liquids and gases Identify and explain some of the everyday applications and consequences of thermal expansion

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Do Now!

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  1. Do Now! Can you continue with the questions you were doing last lesson (Expansion)?

  2. Today’s lesson • Describe qualitatively the thermal expansion of solids, liquids and gases • Identify and explain some of the everyday applications and consequences of thermal expansion • Describe qualitatively the effect of a change of temperature on the volume of a gas at constant pressure

  3. Gather round!

  4. Expansion • Many substances expand when heated • When heated, the particles (atoms or molecules) in a substance vibrate more • This means they need more space • So the substance expands Heat

  5. Heat Important note! The particles in a substance do not expand themselves! Particles are the same size

  6. Contraction • The opposite happens when most substances are cooled • The particles vibrate less • They need less room • The substance contracts Cools

  7. Solids • The expansion of solids is small but strong! Like me!

  8. Expansion in solids This means that we sometimes have to take into account expansion

  9. Expansion in solids This means that we sometimes have to take into account expansion

  10. Contraction can also be a problem

  11. Liquids • Most liquids expand when heated

  12. Gases • Gases expand a lot when heated! • http://www.youtube.com/watch?v=A843PL6Yejs&feature=related • http://www.youtube.com/watch?v=ZgTTUuJZAFs&feature=related

  13. Let’s try an expanding worksheet!

  14. Temperature and volume of a gas at constant pressure • http://phet.colorado.edu/en/simulation/gas-properties

  15. Temperature and volume of a gas at constant pressure • When a gas is heated (at constant pressure), the gas expands. • Can you copy this please?

  16. HOMEWORK • Due Thursday 22nd March • Finish Expansion, Evaporation and Gas pressure sheets

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