It refers to the movement of air and is expressed as a human-perceived speed, measured using an anemometer. Wind speed is expressed as the distance that air molecules travel per second, usually expressed in miles or kilometers. Depending on the strength of the wind, it is expressed in various terms such as weak wind, strong wind, storm, and hurricane. Wind direction and strength are important information as they affect weather changes and daily life, such as controlling temperature and humidity in the air. provided by