Wind is motion of atmospheric gas relative to the underlying surface. A pressure gradient accelerates air toward lower pressure, while the Coriolis force deflects moving air in a rotating frame and friction alters flow near the surface. Consequently, large-scale wind need not point directly from high to low pressure: approximate geostrophic balance can produce flow nearly along pressure contours.
An anemometer measures the local motion. A stated wind observation needs its height, averaging interval and directional convention, because gusts and surface obstacles produce variability. Vertical air motion is also physically important: an updraft transports heat and moisture and can support growing hail.
Wind is the movement of air relative to the surface of the Earth. It is caused by differences in atmospheric pressure, which can occur due to various factors, including temperature variations, the Earth's rotation, and geographical features. When air is heated, it expands and becomes less dense, causing it to rise. Cooler air, being denser, will move in to take its place, creating wind.
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