Which of the following weather
instruments measures wind direction?
R. weather vane
S. anemometer
T. sling psychrometer V. weather balloon
A. Weather Vane
The weather instrument that measures wind direction is the weather vane (option R). To determine the answer to this question, you can analyze the function of each instrument:
1. Weather vane (option R): This instrument is designed to point in the direction from which the wind is coming. It consists of a freely rotating shaft with a directional arrow or pointer. As the wind blows, the arrow aligns itself with the wind direction.
2. Anemometer (option S): This instrument measures wind speed, not wind direction. It typically consists of cups or blades that rotate as the wind blows, and the rotation speed is used to calculate the wind speed.
3. Sling psychrometer (option T): This instrument is used to measure relative humidity and air temperature, not wind direction.
4. Weather balloon (option V): A weather balloon is used to measure various atmospheric conditions, such as temperature, humidity, and air pressure, at different altitudes. It does not directly measure wind direction.
Therefore, the correct answer is the weather vane (option R) as it specifically measures wind direction.