The differential pressure is 797.9 - 715.7 = 82.2 torr = 138815.25 Pa The height of the mercury in the open-end arm is calculated using ΔP = ρgh The density of mercury is 13560 kg/m3 The height of the mercury is 138815.25 Pa = 13560 kg/m3 (9.81 m/s2) h h = 1.04 m
