The Atmosphere Table of Contents The Air Around You Air Pressure
Air Pressure Weight of the atmosphere per unit area. Atmosphere is made of gas molecules moving...
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Transcript of Air Pressure Weight of the atmosphere per unit area. Atmosphere is made of gas molecules moving...
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Air Pressure
Weight of the atmosphere per unit area.
Atmosphere is made of gas molecules moving equally in all directions
What causes air pressure to change?
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Why Does Air Pressure Change?
1.Constant Temperature Change
Warm Air = Low Pressure
Cold Air = High Pressure
2. Changing Humidity Water vapor is less than 1% of air Weighs less than N or O Humid Air = Low Pressure
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COLD AIR WARM AIR
High Pressure Low Pressure
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Air Pressure Units
Millibar
Isobars: Lines that join areas of equal pressure at the same timeMILLIBAR
ISOBAR
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Highs & Lows Pressure Gradients
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Pressure Gradient
Strong Pressure Gradient: Isobars are located close together Strong Wind
Weak Pressure Gradient: Isobars are far apart Weak Wind
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What Causes Winds?
Wind results from differences in air pressure High Pressure= Lots of air Low Pressure= Not a lot of air
Wind: movement of air from high to low pressure
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Sea Breezes Occur during the day Land heats up faster than the ocean High Pressure on Ocean, Low pressure on
Land The air moves from the high pressure (ocean)
to the low pressure (land)
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SEA BREEZE
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Land Breeze Usually at night Land cools faster, making it colder than the sea High Pressure on Land, Low above Ocean This makes the air move from high pressure
(land) to low pressure (ocean)
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Land Breeze
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The Coriolis Effect
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Global Wind Belts Unequal heating creates a giant transfer system. Moves warm air towards high altitudes and cool
air towards the equator.
Creating Wind Belts!
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Measuring Winds Wind Vein: Determines wind direction Anemometer: Speed is determined by the rotation of
the cups on the anemometer Knot: the unit used to measure wind speed
1 Knot = 1.15 miles or 1.85 Kilometers