Air Pressure  The ___________ _________________ object by the air. –Occurs in all ______________  up, down, sideways

Air Pressure  A _______________ is used to measure the amount of ______________ in the air. –Units = ____ _____ (millimeters of Mercury) or atm (atmospheres)

Barometers  Rapidly falling pressure almost always means an ____________ __________ __________.  Rapidly rising pressure almost always means __________ and _________ __________ is ahead.

Winds  Winds are created by horizontal ____ _____________ ___________ – pressure ________  Uneven _________ of the Earth creates pressure differences

What affects wind?  Pressure __________- Cause air to move  The ____________ Effect- causes global winds to be deflected  __________- slows down air, which changes wind _________

Measuring Pressure  __________- lines of equal pressure –Much like contour lines, but instead of elevation, they are lines of _________ ____________ –Are used to __________ where weather is moving

Jet Stream  Fast flowing, relatively narrow _____ __________ found just under the tropopause  Form at the boundaries of adjacent global wind belts

Global Winds  Global winds are created by the _______ __________ of Earth.  The equator is much ___________ than the rest of Earth, causing an extremely _______ pressure.

Global Winds  This causes air from adjacent areas to move towards the ___________.  This movement begins a chain reaction of ______ _______________ throughout Earth, creating 6 wind belts.

High Pressure Zone/Anticyclone  Occurs when temperatures are cold  Little or no moisture (humidity) –The air is heavy and sinks towards Earth’s surface  Winds move outward and clockwise around the center of an anticyclone

Low Pressure Zone/Cyclone  Occurs when temperatures are warm  Can have large amounts of moisture (humidity) –The air is light and rises upward into the atmosphere  Winds move outward and counterclockwise around the center of the cyclone

The Coriolis Effect  The Coriolis effect is a result of the spinning of Earth.  As Earth spins, anything moving in a straight line from North to South will be deflected sideways. –In the Northern Hemisphere, winds, water, and other fluids will be deflected to the right at a 90 o angle. –In the Southern Hemisphere, everything will be deflected to the left at a 90 o angle.

Assignment  Complete procedure questions for “Air Pressure Demonstration”  Identify Types of Energy Transfers Worksheet