ABSTRACT
Answer. Because the vapor pressure of water at 212°F is 14.7 psia (standard barometric pressure at sea level), the equivalent head in feet of 62°F water is 14.7 X 2.31 = 33.9 ft. The specific gravity of water at 2l2°F is 0.959. Then water at this temperature has a vapor pressure of 33.9 + 0.959 = 35.4 ft. of 2l2°F water.
