Air moves through the human trachea at 2.9 m/s during inhalation. Assume that a constriction in the bronchus exists at which the speed doubles. By what amount (in Pa) does the air pressure change as it flows through the constriction? Treat the air as an ideal fluid, and take the density of air to be 1.2 kg/m3. (Hint: does the pressure increase or decrease? Also, please give your answer in Pa.)