Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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Which method of measuring air pressure utilizes mercury in a bulb?

Aneroid Barometer
Digital Barometer
Mercury Barometer
Altimeter

The correct answer is: Mercury Barometer

The method of measuring air pressure that utilizes mercury in a bulb is the mercury barometer. This instrument operates on the principle of measuring the height of a column of mercury in a glass tube, which is inverted into a reservoir of mercury. The weight of the mercury column creates a pressure that is balanced by the atmospheric pressure acting on the surface of the mercury in the reservoir. As atmospheric pressure changes, the height of the mercury column also changes, providing a direct measurement of air pressure in millimeters or inches of mercury. This specific use of mercury is significant because mercury has a high density, allowing for a shorter column to effectively represent atmospheric pressure compared to other liquids. This efficiency makes the mercury barometer a traditional standard for measuring atmospheric pressure.