An open-end mercury manometer is to be used to measure the pressure in an appara

Question

An open-end mercury manometer is to be used to measure the pressure in an apparatus 5 containing a vapor that reacts placed on top of the mercury in the arm silicon 765 mm Hg. attached to the apparatus. Atmospheric Pressure is (a) Draw a schematic of the apparatus. (b) If the level of mercury in the open end is 365 mm below the mercury level in the other arm, what is the pressure (mm Hg) in the apparatus? (e) When the instrumentation specialist was deciding on a liquid to put in the manometer, she listed several properties the fluid should bave and eventually selected silicon oil. What might the listed properties have been?

Explanation / Answer

B)

SG of mercury = 13.54 g/cc.

SG of your oil = 0.92 g/cc.
13.54 / 0.92 = 14.717
100mm/14.717 = 6.795 mm height difference in mercury,

at equal pressure both sides of manometer, to balance the oil. The open end has no oil, so is higher by that much.
365 + 6.795 = 371.795mm. actual difference in height. This is BELOW atmospheric.
765 - 371.795 = 393.205 mm.

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