ABSTRACT
The wind goeth toward the south, and turneth about unto the north; it whirleth about continually, and the wind returneth again. The constant motion of the earth's atmosphere consists of both horizontal and vertical dimensions. All life on the earth has evolved or has been sustained with mechanisms dependent on-air movement: pollen is carried by winds for plant reproduction; animals sniff the wind for essential information; wind power was the motive force that began the earliest stages of the industrial revolution. Gravity holds the atmosphere close to the earth's surface. The force of gravity decreases as an inverse square of the distance between the two bodies. Thermal conditions affect density, which, in turn, cause gravity to affect vertical air motion and planetary air circulation. Atmospheric air is a mixture of gases, so the gas laws and other physical principles govern its behavior. Wind energy is the movement of the wind to create power.
