Which device is commonly used to measure wind speed?

The rotating cup anemometer is the device commonly used to measure wind speed, and it operates on a straightforward principle. As wind flows past the anemometer, it turns a set of cups attached to a rotating shaft. The speed at which these cups spin correlates directly with the wind speed; faster winds cause the cups to rotate more quickly. This device is widely used because it provides accurate, real-time measurements of wind speeds, making it essential for various applications in meteorology, aviation, and outdoor activities such as sailing and gardening.

In contrast, a hygrometer is designed to measure humidity levels in the air and would not provide any information about wind speed. A barometer measures atmospheric pressure, which can be useful in weather forecasting but is not related to wind speed. A thermometer measures temperature, serving a different purpose altogether in meteorological assessments. Understanding these distinctions reinforces the importance of the rotating cup anemometer as an essential tool in meteorological observations.