You need to measure air flow velocity. You order a commercially available Pi tot-static

Chapter 4, Problem 4.75

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You need to measure air flow velocity. You order a commercially available Pi tot-static tube, and the accompanying instructions state that the airflow velocity is given by {h. v(ft/min) = I096.7,f"d where hv is the "velocity pressure" in inches of water and dis the density in pounds per cubic foot. The velocity pressure is the deflection measured on a water manometer attached to the static and total pressure ports. The instructions also state the density d can be calculated using d (lbm/ft3 ) = 1.325 ~where P" is the barometric pressure in inches of mercury and Tis the absolute temperature in degrees Rankine. Before you use the Pi tot tube you want to confirm that the equations are correct. Determine if they are correct.