Which which Instrument is used to measure air speed?
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Anemometer is used to measure the wind speed. An anemometer looks like a weather vane, but instead of measuring the direction of wind with pointers, it has four cups so that it can accurately measure wind speed.
The most common type of anemometer has three or four cups attached to horizontal arms. The arms are attached to a vertical rod. As the wind blows, the cups rotate, making the rod spin. The stronger the wind blows, the faster the rod spins. The anemometer counts the number of rotations, or turns, which is used to calculate wind speed. Because wind speeds are not consistent—there are gusts and lulls—wind speed is usually averaged over a short period of time.