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What is Air Pressure?
• The weight of the air pushing down on us and everything else around us.
• Happens because of the gravitational pull.
Air Pressure
• Air pushes on you with a force of 14.7 pounds per square inch. The force on 1,000 square centimeters (a little larger than a square foot) is about a ton!
Why doesn't all that pressure squash me? • Remember that you have air inside your
body too, that air balances out the pressure outside so you stay nice and firm and not squishy.
HIGH & LOW PRESSURE SYSTEMS
HIGH PRESSURE
• Cold• Dry• Sinking air• Clockwise
rotation
LOW PRESSURE
• Warm• Moist• Rising air• Counterclockwi
se rotation
Cold, dry air = higher pressure (heavier) Molecules spread out;
Fewer molecules in a certain space
Molecules crowd together;More molecules in
a certain space
Compare Warm Air and Cold AirWarm, moist air = lower pressure (lighter)
How does air pressure relate to weather?
• Helps to determine if there will be rain or sunny skies; cold or hot air; etc…
Low Pressure systems
• Warm • Humid• Rainy• Cloudy weather• Thunderstorms• Severe weather• The warm air rises, condenses, forms clouds
and rains!
Front Animations
• Cold Front• Warm Front• Stationary Front• Occluded Front