A closed-tube manometer is filled with a nmineal oil whose density is 0.857 g/cm^3. What is the pressure in mm Hg if you measure a height of the mineal oil equal to 79.3 mm? The density of mercury is given as 13.586 g/cm^3.
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http://hyperphysics.phy-astr.gsu.edu/hbase/pflu.html