Question

How does a psychrometer
measure relative humidity?
(1 point)
It compares wet air and
dry air at two different
elevations.
It compares the level of
moisture in the air at
different times of the day.
It compares the
temperature to the level of
moisture in the air.
It compares the
temperature in wet air and
dry air.

Answer 1

A psychrometer measures relative humidity by comparing the temperature in wet air and dry air. The device typically consists of two thermometers: one with a dry bulb exposed to the air and the other with a wet bulb that has a damp wick around it. The evaporation from the wet bulb cools down its temperature, and the difference in temperature readings between the two thermometers is used to calculate the relative humidity. Therefore, the correct answer is:

**It compares the temperature in wet air and dry air.**