Pressure between oil and water

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Problem# h2phy1 - Pressure converted inside the Aorta

Problem# h2phy2 - Pressure inside vein

Problem# h2phy3 - Pressure on the floor

Problem# h2phy4 - Pressure under the sea

Problem# h2phy5 - Pressure between oil and water

The U-tube contains water of density&nbspρ_w in the right arm
and oil of unknown density ρ_x in the left.   Measurement gives
L = 135 mm. and d = 12.3 mm. What is the density of the oil ?

Strategy - the rule "Must have" of Mr.Zhang ®

Interface area is joint of the two substances. P = (Po) + (Pg) Absolute pressure = Atmospheric pressure + Gauge pressure       Material or Object         Density (kg/m3)     Water: 20 οC and 1 atm 0.998x103   1 atm = 760 mmHg = 760 torr = 29.9 in.Hg =101.325 kPa = 14.7 lb/in.2

Solution Pint = Po +&nbspρwgl          (right side)  →(1) Pint = Po +&nbspρoilg(d+l)    (left side)  →(2) (1)=(2);   Po +&nbspρwgl = Po +&nbspρoilg(d+l)     ρwgl = ρoilg(d+l)     ρwl = ρoil(d+l)     (ρw)/(d+l) = ρoil ∴The density of the oil is 916.5 kg/m3

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