diameter b J: pressm'e P2 / pressure P1 ' --------------- - - - - mercury Air is blown through a circular and horizontal Venturi tube, as shown in the figure below. The diameter of the narrow section is b = 0.7 cm, and it is a = 2 cm for the wider section. The height difference, h, of the mercury columns is measured to be 2.0 mm. What are the air speeds in the (a) wider and the (b) narrower sections of the tube? The density of mercury is 13600 kg/m3. Assume the density of air is 1.3 kg/m3. a) b)