3.53. WP Two mercury manometers, one open-end and the other sealed-end, are attached to an air duct. The reading on the open-end manometer is 25 mm and that on the sealed- end manometer is 800 mm. Determine the absolute pressure in the duct, the gauge pressure in the duct, and the atmospheric pressure, all in mm Hg. 3.54. A student goes to the laboratory supply room and obtains five feet of clear plastic tubing with an outer diameter of 1/2 inch and a wall thickness of 1/16 inch. She bends the tube into a U shape with the open ends pointing up and uses a funnel to pour 75 mL of water into the tube. By blowing air into one end of the tube, she generates a 6-inch difference in the water levels on each side. a. What was the pressure (atm) she exerted with her lungs on the water in the tube? State all assumptions you make. b. If the fluid had been ethanol instead of water, what would the difference in the liquid levels have been? > Answer 3.55. WP Three different liquid used in the manometer shown here. P2 PA •PB Pc a. Derive an expression for P – P2 in terms of pA » PB » PC , h1 , and h2 . b. Suppose fluid A is methanol, B is water, and C is a manometer fluid with a specific gravity of 1.37; pressure P, = 121.0 kPa ; hị = 30.0 cm ; and h2 24.0 cm . Calculate P (kPa).

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