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Under “AIR” Pressure

Under “AIR” Pressure. Earth's Atmosphere. Earth is approx. 6000 km thick Atmosphere is approx 100 km thick. Earth. Why is the Atmosphere Important: Supports Life Creates our weather Protects us from harmful radiation. atmosphere. Other Gases Include: Argon 0.93%

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Under “AIR” Pressure

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  1. Under “AIR” Pressure

  2. Earth's Atmosphere Earth is approx. 6000 km thick Atmosphere is approx 100 km thick Earth • Why is the Atmosphere Important: • Supports Life • Creates our weather • Protects us from harmful radiation atmosphere

  3. Other Gases Include: Argon 0.93% Carbon Dioxide 0.036% Neon 0.0018% Helium 0.00052% Methane 0.00015% Krypton 0.00011% Hydrogen 0.00005% • The atmosphere is the layer of gases that surround the planet 78% 21% 1%

  4. Layers of the Atmosphere

  5. What happens to temperature as you go higher in the atmosphere?

  6. Air pressure and the troposphere 80% of atmospheric gases are in the troposphere: the 15km of the atmosphere closest to Earth. This is a very thin layer compared to the Earth’s diameter, which is 12,756 kilometers. Atmospheric gases are made up of tiny particles, each of which exerts pressure in all directions. Higher up in the atmosphere, there are fewer particles, which causes a decrease in air pressure. Nearly all weather takes place in the troposphere.

  7. What is Air Pressure? • The result of the weight of a column of air pushing down on an area • Greater pressure means there are more air molecules to push down • Air pressure is measured with an instrument called a barometer in “inches of mercury” or “millibars (mb)”

  8. Which of these would be under high pressure? Which would be under low pressure? B. A. HIGH LOW

  9. Which of these would we find at the surface of the Earth? X B. A.

  10. Which of these would we find high up in the atmosphere? X B. A.

  11. Answer this question with your partner: Why do your ears hurt when you swim down deep in the swimming pool? My ears are hurting…10 feet of water is pushing on my ear drums!!

  12. Coffee Can Demo So where is the pressure highest?

  13. Hoover Dam Lake Mead Colorado River What do dams do? ?

  14. Hoover Dam 2nd highest dam in U.S. Top of Hoover Dam is 45 feet thick Bottom of Hoover Dam is 660 feet thick Why is it so much thicker at the bottom?

  15. Answer this question with your group: What happens to air pressure as you get higher in the atmosphere? WHY? • Air pressure DECREASES the higher the altitude • This is why air is said to be “thinner” in the mountains, because there is less air pressure, and the air is less dense • Why is the air pressure greater at the surface of the Earth? • The column of air pushing down is greater than when you are higher up the atmosphere • GRAVITY!!!

  16. Air Molecules Comparison: Top of Mountain to Bottom of Mountain

  17. Red Bull & the Edge of Space • Let’s put this all together and learn about how Felix made a record breaking sky dive • http://www.redbullstratos.com/

  18. Exit Ticket • Answer the Test Preparation questions (#26-29) on p. 459 on your notecard. • Make sure to write your name on it and turn it in the basket before you leave.

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