Prentice Hall Earth Science ch19 air masses wind
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Transcript of Prentice Hall Earth Science ch19 air masses wind
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Chapter
1919Air Pressure and Wind
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Air Pressure Defined
19.1 Understanding Air Pressure
Air pressure is the pressure created by the weight of air.
Air pressure is exerted in all directions— down, up, and sideways.
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Measuring Air Pressure
19.1 Understanding Air Pressure
A barometer is an instrument used for measuring air pressure.
When air pressure increases, the mercury in the tube rises. Measured in millibars (mb) of mercury.
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Factors Affecting Wind
19.1 Understanding Air Pressure
Wind is the result of horizontal differences in air pressure. Air flows from areas of higher pressure to areas of lower pressure.
• A pressure gradient is the amount of pressure change occurring over a given distance.
• Closely spaced isobars—lines on a map that connect places of equal air pressure—indicate a steep pressure gradient and high winds.
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Isobars connect places of equal pressure
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Airflow Patterns, Surface and Aloft
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Surface Pressure
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Sea and Land Breezes
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How Wind Is Measured
19.3 Regional Wind Systems
•
An anemometer is an instrument used to measure wind speed.
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Global Wind PatternsGlobal Wind Patterns