A. Relative Humidity
B. Specific Gravity
C. Rainfall
D. Salinity
Correct Answer:
Option A – Relative Humidity
Explanation
A hygrometer is 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.
Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer.