Mathematics · Fluid Mechanics

An oil of specific gravity 0.8 is flowing through a pipe. A differential manometer connected at two points, A and B, shows a difference in the mercury level of 20 cm. What will be the difference between the pressures at the two points? (Take density of mercury = 13600 kg/m3, density of water = 1000 kg/m3, and g = 10 m/s2)