Two vessels are connected to a differential manometer using mercury (s=13.56), the connecting tubing being filled with water. The higher-pressure vessel is 5 ft lower in elevation than the other. Room temperature prevails. If the mercury reading is 4.0 in, what is the pressure difference in feet of water, and in psi? If carbon tetrachloride (s=1.59) were used instead of mercury, what would the manometer reading be for the same pressure difference?