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3 February 2012

3 February 2012. OBJECTIVE: Identify the components of air and understand how air pressure changes. INTRO: Hand-in Missing Assignments Write Q&A in notebook: Have your ears ever popped? What were you doing that made them pop? What do you think causes your ears to pop?.

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3 February 2012

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  1. 3 February 2012 OBJECTIVE: Identify the components of air and understand how air pressure changes. • INTRO: • Hand-in Missing Assignments • Write Q&A in notebook: • Have your ears ever popped? • What were you doing that made them pop? • What do you think causes your ears to pop?

  2. Air and Air Pressure

  3. Air and Air Pressure • Atmosphere • Air • Made of air which is made of different gases • 78% = nitrogen • 21% = oxygen • 1% = carbon dioxide, water vapor and other rare gases • Pulled down by gravity which creates air pressure

  4. Air and Air Pressure • Air pressure • The measure of force air molecules push on a surface • As air molecules are pulled down by gravity, they collide and become squeezed together, that force is air pressure. Air Pressure Demo

  5. Air and Air Pressure • High air pressure • Low air pressure • Clear skies • More Sun • Less wind • Drier weather • Clouds • Less Sun • More wind • Possibly precipitation

  6. Air and Air Pressure • isobar • Line drawn on a weather map that connects points of equal pressure Adobe: Airflow

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