Why does the wind blow

Why does the wind blow - Wind 13:50 Whydoesthewindblow...

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Wind 13:50 Why does the wind blow? What is wind?---A mass or volume of air in  motion Wind has kinetic energy-should be able to do work -Wind results from differential heating of the Earth by the sun -As air is heated, it expands—becomes less dense and lighter -Tends to rise back up into atmosphere Air heated by sun is going to rise in the atmosphere Cooler, more dense air flows along Earth’s surface to replace heated air. -The heated air in the upper atmosphere flows in the opposite direction. -As this air cools, it become more dense (becomes “heavier”) and sinks. Air that is less dense is at lower pressure Air that is more dense is at higher pressure When high pressure weather front comes, pressure drops because it brings cool  air -When wind blows always from same direction VERTICAL WINDWILL
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HORIZONTAL WINDMILL Turret Mills-only the top rotators EXAMPLES OF WORK -grinding grain
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This note was uploaded on 10/18/2010 for the course EGEE 101 at Penn State.

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Why does the wind blow - Wind 13:50 Whydoesthewindblow...

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