Air Pressure and Wind. The force exerted by air molecules as they collide with a surface The weight of the atmosphere as it pushes on Earth’s surface. What is air pressure?. Air has mass Gravity pulls these molecules towards Earth giving them weight
Air Pressure and Wind
The force exerted by air molecules
as they collide with a surface
The weight of the atmosphere as it
pushes on Earth’s surface
Air has mass
Gravity pulls these molecules towards Earth giving them weight
The weight of the molecules is air pressure
Why don’t all of our houses collapse?
Or Why aren’t we all squished?
CHECK THIS OUT!!!
Extreme Atmospheric Pressure
Air pressure is exerted (pushes) in all directions
An equal force pushing down is balanced by air pushing up
The barometer is the instrument used to measure air pressure
2 types of barometers
The Aneroid barometer
Complete the graphic organizer by filling in the 3 factors that affect pressure. Then create branches explaining how they cause pressure to change.
(height above sea level)
High Altitude / Low Pressure
Low Altitude / High Pressure
(the amount of water vapor in air)
Low Humidity / High Pressure
High Humidity / Low Pressure
High Temperature / Low Pressure
Low Temperature / High Pressure
Generally associated with stormy weather.
The air is rising.
Generally associated with clear skies.
Air is sinking.
HIGH PRESSURE to LOW PRESSURE
Factors Affecting Wind Direction and Speed
objects are deflected to the RIGHT in the Northern Hemisphere and the LEFT in the Southern Hemisphere
The effect (curve) increases as the speed increases
The effect DOES NOT depend on the objects direction
The effect is greater at the poles and less at the equator
Most noticeable of large distances (Not in TOILETS)
Global and Local Winds
Climate Zones due to global winds:
** Add these areas to your worksheet
A Monsoon is a seasonal change in winds.
Ex. India, North America