Answer:
Option (A)
Explanation:
A barometer is a device that is commonly used in the field of meteorology in order to measure the atmospheric pressure. This atmospheric pressure normally varies depending on the elevation, which could be above or below the mean sea level. So it can be precisely used at any particular elevation. It is easy to carry and is very widely used. The mercury liquid is commonly used in the barometer. The SI unit of atmospheric pressure is Pascal.
So, it is a very important device that helps in determining the weather condition at any given place.
Thus, the correct answer is option (A).
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