Presentation on theme: "19.1 Understanding Air Pressure. What is Air Pressure? The force exerted by the weight of a column of air above a given point Exerted in all directions."— Presentation transcript:
What is Air Pressure? The force exerted by the weight of a column of air above a given point Exerted in all directions The air pressure pushing down on an object exactly balances the air pressure pushing up on the object Barometer – used for measure air pressure Air pressure rises, mercury in the tube rises (and opposite)
Factors Affecting Wind Wind is the result of differences in pressure Air flows from areas of higher pressure to areas of lower pressure The unequal heating of Earth’s surface generates pressure differences Solar radiation is the ultimate energy source for most wind Named based off what direction it comes from
Continued… 3 Factors combine to control wind Pressure Differences -Pressure Gradient -Closely spaced isobars indicate a steep pressure gradient & high winds. -Widely spaced isobars indicate a weak pressure gradient & light winds Coriolis Effect Friction -Slow air movement (changes wind direction) -Most prominent features of airflow high above the friction layer is the jet streams
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