5th grade ch 8 lesson 1 how does air move
TRANSCRIPT
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Lesson 1How does air move?
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About 2/10-
oxygen
CO2, water vapor,
& other gases
About 8/10-
nitrogen
gases in air
Chart of gases that make up atmosphere
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5 layers of Earth’s atmosphere
eexosphere
tthermosphere
mmesosphere
sstratosphere
ttroposphere
(weather)
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air pressure decreases as air pressure decreases as you move up higher you move up higher
b/c gas particles get farther b/c gas particles get farther apart- less air above youapart- less air above you
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Air Pressure-Activity1. Lay a ruler on a table with about 3" (8 cm) hanging over the edge.
2. Lay a sheet of printer paper on the part of the ruler in direct contact with the table.
3. Press the paper against the table until it is flat as possible.
4. Press down on part of the ruler hanging over the edge.
5. Repeat the above steps except replace the printer paper with a large sheet of opened newspaper in the second step.
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convection current
• gases or liquids rise & sink in circular path due to differences in temp.
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cool air warm air
1. particles closer
together
2. heavier
1. particles farther apart
2. lighter
create convection
currents
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wind
• air moves from place of high air pressure place of low air pressure
• move from west east in U.S.
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NorthNorth
SouthSouth
WestWest EastEast
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jet stream
• band of very fast wind formed by different temps. between convection currents
• found high above ground
• change temp, winds & precipitation
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The Jet Stream [00:34]
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5 layers of Earth’s atmosphere
eexosphere
tthermosphere
mmesosphere
sstratosphere
ttroposphere
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As altitude increases, how does air pressure change? Why?
• Air pressure decreases as you go up through the atmosphere because the gas particles in the air get farther apart and there is less air above you.
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•Nitrogen
•Oxygen
•Other gases
about 8/10
about 2/10
water vapor, carbon dioxide, helium, etc.
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What causes convection currents?
• Different temperatures cause convection currents. Cooler air is heavier than warm air. Cool air will sink, forcing warm air to rise.
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In what direction do surface winds over the United States
generally blow?
• Winds generally blow from west to east in the United States.
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At night, land cools more than water. Air above land will be cooler than air above the
water. What conclusion can you draw about
convection currents near the ocean at night?