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Chapter 22 Section 1 Review Page 554 (1-8)
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1. Describe the composition of dry air at sea level.
Nitrogen = 78% Oxygen = 21% Argon = 0.9% Other gases (like CO2 < 0.1%
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Gases in the Atmosphere
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2. Identify five main components of the atmosphere.
Nitrogen Oxygen Water Vapor Ozone Particulates
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Particulates
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3. Explain the cause of atmospheric pressure.
Atmospheric pressure is caused by the weight of atmospheric gases as a result of gravity pulling the gas molecules toward Earth.
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Atmospheric Pressure
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4. Explain how the two types of barometers measure atmospheric pressure.
Mercurial Barometer: Atmospheric pressure pushes on the well at the base of the barometer. This holds the level of the mercury in the tube at a height indicating the air pressure.
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Mercury Barometer
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Mercury Barometer
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4. Explain how the two types of barometers measure atmospheric pressure.
Aneroid Barometer: Atmospheric pressure pushes in on the side of a sealed metal container causing the sides of the container to bulge in or out, moving the pointer on a scale showing the air pressure.
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Aneroid Barometer
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5. Identify the layer of the atmosphere in which weather occurs.
Weather happens in the troposphere.
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Weather in the Troposphere
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6. Compare the four main layers of the atmosphere.
Troposphere: lowest layer, weather happens here, highest pressure Stratosphere: second layer, contains the ozone layer, gets warmer as you go up Mesosphere: coldest layer, meteors burn up here, gets colder as you go up Thermosphere: hottest layer, ionosphere is here so auroras happen here, hottest layer, lowest air pressure (near zero)
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Layers of the Atmosphere
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7. Identify the two atmospheric layers that contain air as warm as 250 C?
The troposphere and the thermosphere
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Temperature Ranges of Layers
25o C 25o C Thermosphere Troposphere
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8. Why is atmospheric pressure generally lower beneath a mass of warm air than beneath a mass of cold air? Molecules move farther apart when they are heated, so there are fewer particles in a given area to exert pressure.
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Cause of Atmospheric Pressure
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The End…..
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