A manometer consists of a U-tube, 7 mm internal diameter, with vertical limbs each with an enlarged upper end of 44 mm diameter. The left-hand limb and the bottom of the tube are filled with water and...

A manometer consists of a U-tube, 7 mm internal diameter, with vertical limbs each with an enlarged upper end of 44 mm diameter. The left-hand limb and the bottom of the tube are filled with water and the top of the right hand limb is filled with oil of specific gravity 0.83. The free surfaces of the liquids are in the enlarged ends and the interface between the oil and water is in the tube below the enlarged end. What would be the difference in pressures applied to the free surfaces which would cause the oilwater interface to move 1 cm?