Wind

Wind is the flow of gases on a large scale. On Earth, wind consists of the bulk movement of air. Wind are commonly classified by their spatial scale, their speed, the types of forces that causes them, the regions in which they occur, and their effect. In meteorology, winds are often referred to according to their strength, and the direction from which the wind is blowing. Winds can shape landforms, via a variety of Aeolian processes such as the formation of fertile soils, such are loses, and the erosion

Wind is caused by differences in pressure. When a difference in pressure exists, the air is accelerated from higher to lower pressure. Wind direction is reported by the direction from which it originates. For example, a northerly wind blows from the north to the south.
Wind energy is the kinetic energy of the air in motion. Total wind energy flowing through an imaginary area A during the time t is:
E = A . v . t . ρ . ½ v²,
where v is the wind velocity and ρ is the air density. The formula presented is structured in two parts: (A . v . t) is the volume of air passing through A, which is considered perpendicular to the wind velocity; (ρ . ½ v²) is the kinetic energy of the moving air per unit volume.
Total wind power is:
P = E / t = A . ρ . ½ v³
Wind power is thus proportional to the third power of the wind velocity.