(Solution) - An open end mercury manometer is to be used to measure -(2025 Original AI-Free Solution)

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An open-end mercury manometer is to be used to measure the pressure in an apparatus containing a vapor that reacts with mercury. A 10 cm layer of silicon oil (SG = 0.92) is placed on top of the mercury in the arm attached to the apparatus. Atmospheric pressure is 765 mm Hg.
(a) If the level of mercury in the open end is 365mm below the mercury level in the other arm, what is the pressure (mm Hg) in the apparatus?
(b) When the instrumentation specialist was deciding on a liquid to put in the manometer, she listed several properties the fluid should have and eventually selected silicon oil. What might the listed properties have been?