Air

-has weight -the weight of air is known as air pressure -the standard atmosphericpressure at sea level is 14.7 lbs per square inch.

MEASURING ATMOSPHERIC PRESSURE
 * the metric unit of measuring atmospheric pressure is MILLIBARS(mb).
 * the standard A.P. at sea level is 1013.2mb


 * The other unit of measuring A.P. is inches of Mercury(Hg).
 * the standard A.P. at sea level is 29.92"Hg.

High Pressure = Good weather--Moves clockwise(anticyclonic) Low Pressure = Bad weather--Moves counterclockwise(cyclonic)

Global Wind Patterns ITCZ confluence -coming together
 * Inter
 * Tropical
 * Convergance
 * Zone

Winds are named for their ORIGIN