What does an anemometer measure?

An anemometer measures air velocity, which is essential for understanding wind speed in various applications, including weather forecasting, aviation, and environmental monitoring. This device typically operates by using rotating cups or blades that turn in the wind; the speed at which they rotate is proportional to the wind speed. Accurate measurements of air velocity are crucial for numerous applications, such as optimizing HVAC systems, assessing comfort levels in buildings, and studying airflow patterns.

The other choices refer to different atmospheric conditions. While air pressure is measured by barometers, air temperature is assessed using thermometers, and air humidity is gauged with hygrometers. These instruments serve distinct purposes in the field of meteorology and environmental science, highlighting the specialized function of the anemometer solely focused on measuring the speed or velocity of air movement.