A **mercury barometer** measures:
ADensity of mercury
BAtmospheric pressure
CSpecific gravity of liquids
DViscosity
Answer & Solution
Correct answer: B. Atmospheric pressure
Torricelli's barometer: inverted glass tube of mercury in a dish; atmospheric pressure $p_a = h\rho g$ where $h$ is the mercury column height (typically 76 cm at sea level). Above the mercury column is Torricelli vacuum.
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