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01-22-2014, 03:18 PM
Wind results from air in motion. Air in motion arises from a pressure gradient. Wind can be proadly classified as “planetary” & “local”. Planetary winds are caused by greater solar heating of the earth`s surface near the equator than near the northern or southern poles. This cause warm tropical air to rise and flow through the upper atmosphere towards the poles & cold air from the poles to flow back to the equator nearer to earth’s surface. The direction of motion of planetary winds with respect to the earth is affected by the rotation of the earth. The wam air moving toward the poles in the upper atmosphere assumes an easterly direction that results in prevailing westerlies. The westerlies controls events between the 300 & 600 latitudes. Because the earth`s axis is inclined to its orbital plane around the sun.
Local winds are caused by two mechanisms. The first is differential heating of land & water. So far insulation during the day is readily converted to sensible energy of the land surface but is partly absorbed in layers below the water surface and partly consumed in evaporating some of that water. This is the mechanism of shore breezes. At night, the direction of the breezes is reversed because the land mass cods to the sky more rapidly than the water assuming the clear sky. The second mechanism of local wind is caused by bills & mountain sides. The air above the slop side heats up during the days & cools down at night, move rapidly than the air above the low lands. This causes heated air during the day to rise along the slopes & relatively cool heavy air to flow down at night.
In India the interest in the wind mills was shown in the last fifties & sixties. An wind, in India are relatively low and very appreciably with the seasons. Data quoted by some scientists that for India wind speed value lies between 5 km/hr to 15-20 km/hr.

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