The correct answer is: C. Both
An anemometer is a device used for measuring wind speed and, in some cases, wind direction. The most common type of anemometer is the cup anemometer, which consists of three or four cups mounted on a vertical rod. As the wind blows, the cups rotate, and the number of rotations per minute is measured. This information can then be used to calculate the wind speed.
Anemometers can also be used to measure wind direction. The most common type of anemometer for measuring wind direction is the vane anemometer, which consists of a vane that is free to rotate in the wind. The vane is attached to a pointer that indicates the direction of the wind.
Anemometers are used in a variety of applications, including meteorology, aviation, and wind energy. They are also used in some industrial applications, such as ventilation and air conditioning.
Here is a brief explanation of each option:
- Wind: Wind is the movement of air from one place to another. It is caused by differences in air pressure. Air pressure is the force exerted by the air on a surface. Air pressure is higher at the Earth’s surface than it is higher up in the atmosphere. This difference in air pressure causes the air to move from high pressure areas to low pressure areas.
- Velocity: Velocity is the speed and direction of an object’s motion. The velocity of wind is measured in meters per second (m/s). The direction of wind is measured in degrees from north.
- Both: An anemometer can be used to measure both wind speed and wind direction.