An open-circuit wind tunnel draws in air from the atmosphere through a well-contoured nozzle. In the test section, where the flow is straight and nearly uniform, a static pressure tap is drilled into the tunnel wall. A manometer connected to the tap shows that static pressure within the tunnel is \(45 \mathrm{~mm}\) of water below atmospheric. Assume that the air is incompressible, and at \(25^{\circ} \mathrm{C}, 100 \mathrm{kPa}\) absolute. Calculate the air speed in the wind-tunnel test section.