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Transcript of Wind Energy
And The Science Behind it. What is air? Air is a mixture of gases that circle the Earth, kept in place by gravity. Air makes up Earth's atmosphere.Air consists mostly of nitrogen and oxygen. Also present are traces of other gases and tiny bits of dust, pollen grains from plants, and other solid particles. As our atmosphere extends higher and higher above Earth, toward outer space, air becomes thinner and the combination of gases in the air changes. The Science of Wind The total weight of the atmosphere exerts a pressure of about 14.7 pounds per square inch at sea level. You don't notice this weight, however, because you are used to it. If you live in Denver, Colorado, which is at an elevation of about 5,000 feet, then about 85% of the atmosphere is above you, resulting in an air pressure of about 12.5 pounds per square inch. At the top of Mount Everest (over 29,000 feet), only 30% of the atmosphere lies above you,
leaving an air pressure of only 4.4 pounds per square inch.
The atmosphere of Venus is about 90 times heavier than that on Earth. The Weight of Air This plastic bottle was sealed at approximately 14,000 feet altitude, and was crushed by the increase in atmospheric pressure (at 9,000 feet and 1,000 feet) as it was brought down towards sea level. What is wind?
Wind is air in motion. It is produced by the uneven heating of the earth’s surface by the sun. Since the earth’s surface is made of various land and water formations, it absorbs the sun’s radiation unevenly. Two factors are necessary to specify wind: speed and direction. What is wind and what causes it to blow? What causes the wind to blow?
As the sun warms the Earth's surface, the atmosphere warms too. Some parts of the Earth receive direct rays from the sun all year and are always warm. Other places receive indirect rays, so the climate is colder. Warm air, which weighs less than cold air, rises. Then cool air moves in and replaces the rising warm air. This movement of air is what makes the wind blow. Global wind patterns
The equator receives the Sun's direct rays. Here, air is heated and rises, leaving low pressure areas behind. Moving to about thirty degrees north and south of the equator, the warm air from the equator begins to cool and sink. Between thirty degrees latitude and the equator, most of the cooling sinking air moves back to the equator. The rest of the air flows toward the poles. How do windmills work?
Windmills work because they slow down the speed of the wind. The wind flows over the airfoil shaped blades causing lift, like the effect on airplane wings, causing them to turn. The blades are connected to a drive shaft that turns an electric generator to produce electricity. What Provides the Wave's Energy?
In the case of ocean waves, wind provides the energy. Wind causes waves that travel in the ocean. The energy is released on shorelines.
What Determines the Size of a Wave?
The size of a wave depends on:
1) the distance the wind blows (over open water) which is known as the "fetch",
2) the length of time the wind blows, and
3) the speed of the wind. Waves Teahupoo This is a Monster Wave!! Flying Squirrels! Other things affected by wind They don't fly, they just glide from tree to tree. We could glide, too -- if we had a lot of extra skin stretching from our arms to our legs Most glides are from 20 to 60 feet, but glides as long as 240 feet have been recorded! Frisbees The first trial flights of zeppelins were made in 1900. During WWI the Germans used them to bomb London and Paris. War With Wind This wave however, breaks on a reef that is just a few feet below the water. Wing Suits Balloons The longest verified WiSBASE jump is 4.6 mi by Dean Potter on 2 November 2011. Potter had spent 3 minutes and 20 seconds in flight, covering 9,200 ft of altitude. The longest frisbee throw was just over 1/4 mile (1,320 feet). Initial uses of wind turbines James Blyth's electricity generating wind turbine, photographed in 1891 The first automatically operated wind turbine, built in Cleveland in 1887 by Charles F. Brush. It was 60 feet tall, weighed 4 tons and powered a 12 kW generator.
Air circulation around low pressure centers: The general term cyclone is used for an area of low pressure in the atmosphere that displays circular inward movement of air. In the northern hemisphere, circulation of a cyclone is counterclockwise, whereas southern hemisphere cyclones have clockwise wind patterns. Tropical storms or cyclones in the northern hemisphere usually are called hurricanes, and in the southern hemisphere they are called typhoons A headwind is a powerful, steady air current that lifts and supports the bird's wings so it can remain stationary in the air. Hovering birds, such as hawks, buzzards or gulls, must fly into the headwind at a speed that matches the wind's force in order to hover, according to Stanford University. Wind propels sailboats too! Wind farms in Washington Wind farms around the world Some cool wind related pictures! The end!