Question

A device that uses the wet/dry bulb method to measure the ___________________is the sling psychrometer. As seen here, two thermometers are attached to a handle or length of rope and then are spun around in the air for a few minutes.
A) air currents

B) air temperature

C) light intensity

D) relative humidity

Answer 1

I would say the answer is D

A hygrometer is an instrument used to measure relative humidity. ... To determine the relative humidity, the temperatures are taken from the dry-bulb thermometer and the temperature difference between the wet and dry bulb thermometers.

hygrometer is a weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers -- a dry and wet bulb psychrometer and a mechanical hygrometer.