To measure the pressure of air which instrument is used?
To measure the pressure of air which instrument is used?
(A) Altimeter
(B) Barometer
(C) Ammeter
(D) Electrometer
Barometer is an instrument that measures the air pressure in the atmosphere. It works by comparing the weight of a liquid column of mercury or the expansion of a metal chamber in an aneroid barometer to the weight of the air. Meteorologists use this tool because changes in air pressure are often an indication of weather changes.
Altimeter: While many altimeters (barometric altimeters) use air pressure to estimate altitude, their primary purpose is to measure the height of an object above a fixed level rather than the pressure itself.
Ammeter: This instrument is used to measure electric current in a circuit, typically in units of amperes.
Electrometer: This is an electrical instrument used to measure electric charge or electrical potential difference.