Fig. 1. shows a differential manometer connected at two points A and B. At A air pressure is 100 kN/m². Find the absolute pressure at B. T 650 mm Air Water 250 mm 150 mm Oil (S-0.85) Fig. 1. Mercury (S-13.6) Q#2: In fig 2.2-5b the differential manometer is used to measure the pressure difference between two vessels. Derive the equation for the pressure difference PA- PB in terms of the liquid heights and densities.