Example 1:

Two pipes on the same elevation convey water and oil of specific gravity 0.88 respectively. They are connected by a U-tube manometer with the manometric liquid having a specific gravity of 1.25. If the manometric liquid in the limb connecting the water pipe is 2 m higher than the other find the pressure difference in two pipes.

Given data:

                 Height difference = 2 m

                 Specific gravity of oil s = 0.88

                 Specific gravity of manometric liquid s = 1.25

                 Equating pressure head at section (A-A)

               Substituing h = 5 m and density of water 998.2 kg/m³ we have P _A -P _B = 10791

              Answer:-           10791 Pa