Discussion
Which corrections must be applied to a mercury barometer reading?
Answer: A
The density of mercury and the expansion of the brass scale both depend on temperature, local gravity varies with latitude and altitude, and each instrument has its own small index error. Reduction to mean sea level is a further separate step. Latitude does enter, but through gravity acting on the column rather than through any change in the density of the mercury itself. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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