A manometer is an instrument used for measuring
- Relative density of liquid
-
Pressure in liquids and gases
- Humidity
- Atmospheric pressure
The correct answer is: B
Explanation
a manometer is used to measure pressure in liquids and gases. Manometer gauges measure the pressure of gases and vapors from atmospheric to about 1 Pa by balancing the force exerted by the gas or vapor against the weight of a column of liquid, usually mercury, water, or oil.
There is an explanation video available .