Mercury barometer and an aneroid barometer?

What is the difference between a mercury barometer and an aneroid barometer?

Answer #1

A mercury barometer uses mercury to show the level of atmospheric pressure. The units are millimeters-of-mercury (mmHg). An aneroid barometer is a mechanical gauge which uses an arm that pivots in the center to point out the pressure usually in kilopascals (kPa)

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