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[[File:Mean Wind Speed.png|thumb|Global map of wind speed at 100 meters on land and around coasts.<ref name="global_wind_atlas">{{cite web | url=https://globalwindatlas.info | title=Global Wind Atlas | publisher=[[Technical University of Denmark]] (DTU) | access-date=23 November 2021 | archive-date=18 January 2019 | archive-url=https://web.archive.org/web/20190118095006/https://www.globalwindatlas.info/ | url-status=live }}</ref>]]
[[File: Lee Ranch Wind Speed Frequency.svg|thumb|upright=1.6|Distribution of wind speed (red) and energy (blue) for all of 2002 at the Lee Ranch facility in Colorado. The histogram shows measured data, while the curve is the Rayleigh model distribution for the same average wind speed.]]
[[File:Global_Map_of_Wind_Power_Density_Potential.png|thumb|Global map of wind power density potential<ref>{{Cite web |title=Global Wind Atlas |url=https://globalwindatlas.info/ |url-status=live |archive-url=https://web.archive.org/web/20190118095006/https://www.globalwindatlas.info/ |archive-date=18 January 2019 |access-date=14 June 2019}}</ref>]]
Wind is air movement in the earth's atmosphere. In a unit of time, say 1 second, the volume of air that had passed an area <math>A</math> is <math>Av</math>. If the air density is <math>r</math> , the mass of this volume of air is <math>M=rAv</math>, and the power transfer, or energy transfer per second is <math>P ={\frac {1}{2}}M v^{2}= {\frac {1}{2}}Ar v^{3}</math>. Wind power is thus ''proportional'' to the ''third power'' of the wind speed; the available power increases eightfold when the wind speed doubles. (More precisely, change of wind speed by a factor of 2.1544 increases the wind power by one order of magnitude (multiply by 10).
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