Question

A barometer which measures atmospheric pressure more accurately is:
(A) Fortin’s barometer
(B) Mercury barometer
(C) Aneroid barometer
(D) Torricelli barometer

Answer 1

Hint: As we all know a barometer is used to measures atmospheric pressure, but one of the type of barometer which measures atmospheric pressure more accurately is used as the level of mercury is set to zero by using the thumbscrew to make an ivory pointer just touch the surface of the mercury. The pressure is then read on the column by adjusting the vernier scale so that the mercury just touches the sightline.

Complete step by step answer:
The measurement of atmospheric pressure using a Fortin barometer is achieved much more accurately than by using a simple barometer.
The ambient or atmospheric pressure is measured with a Fortin barometer. The air pressure acting on the surface of the mercury reservoir supports a column of mercury in the Fortin barometer.
A barometer is a scientific device that measures air pressure in a specific environment. Short-term weather changes can be predicted using pressure trends. Surface weather analysis employs a variety of air pressure measures to locate surface troughs, pressure systems, and frontal borders.
Pressure altimeters (the most basic and popular type of altimeter) and barometers are essentially the same instrument, but they serve different purposes. An altimeter is designed to be used at various levels in order to match the corresponding atmospheric pressure to the height, whereas a barometer is retained at the same level and measures small pressure fluctuations induced by weather and weather factors. On the earth's surface, the average air pressure ranges between \[940{\text{ }}and{\text{ }}1040{\text{ }}hPa\left( {mbar} \right)\] . At sea level, the average air pressure is \[1013{\text{ }}hPa\left( {mbar} \right)\] .
Hence, the correct option is (A) Fortin’s barometer.

Note:
At meteorological stations, the Fortin Barometer was extensively used to measure atmospheric pressure. This type of barometer has the advantages of being portable (inverted) and allowing examination of both free surfaces of mercury whose difference in level must be measured.