Air with a density of 0.07 lbm/ft ³ is flowing upward in the vertical duct, as shown. The velocity at the inlet (station 1) is 90 ft/s, and the area ratio between stations 1 and 2 is 0.3 (A₂/A₁ = 0.3). Two pressure taps, 10 ft apart, are connected to a manometer, as shown. The specific weight of the manometer liquid is 120 lbf/ft ³. Find the deflection, Δh, of the manometer.

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10 ft (2)