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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?. - PowerPoint PPT Presentation
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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?
Air and Air Pressure
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
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
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
Air and Air Pressure
• isobar • Line drawn on a weather map that connects points of equal pressure
Adobe: Airflow