A siphon of uniform 50 mm diameter draws water from an open tank and discharges freely to the atmosphere at a point 3 m below the water surface in the tank. The summit of the siphon is 1.5 m above the water surface. Neglecting all losses and taking p_{atm} = 101.3 kPa and g = 9.81 m/s², the absolute pressure at the summit is about