Discussion
Which quantity does a mercury barometer measure directly?
Answer: D
Atmospheric pressure supports a column of mercury about 760 millimetres high, and the height is read against a scale after corrections for temperature, gravity and the instrument's own index. The final option describes an aneroid barometer, which is the more common modern instrument. Mercury barometers remain the reference standard against which others are calibrated despite being displaced from routine use. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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