Question 885Navigation General

70% to pass

On what does the operation of an aneroid barometer depend?

A Column of mercury supported by atmospheric pressure
B Thin, metal, air tight cell
C Expansion of mercury in a closed tube
D Curved tube containing alcohol
AI Explanation

The correct answer is B) Thin, metal, air tight cell. An aneroid barometer operates on the principle of a thin, metal, air-tight cell that expands and contracts with changes in atmospheric pressure. As the atmospheric pressure increases, the cell is compressed, and as the pressure decreases, the cell expands. This movement is then translated into a reading on the barometer's dial, allowing the user to determine the current atmospheric pressure. The other options are incorrect because they describe the operation of other types of barometers, such as the mercury barometer (A) and the alcohol barometer (D), which use different mechanisms to measure atmospheric pressure.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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