Pressure Relationships

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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Thermodynamics TEMPERATURE AND PRESSURE MEASUREMENTS Example 2: Pressure Relationships What is the absolute pressure at the bottom of a swimming pool 6 feet deep that is filled with fresh water? P_atm = 14.7 psia Solution: P_abs = P_atm + P_gauge = 14.7 + rH = 14.7 + [(62.4 lbm/ft³)(6 ft)/(144 in.²/ft²)] = 14.7 + 2.6 P_abs = 17.3 psia In addition to pounds per square inch, pressure can be measured with reference to the force that exists in a column of fluid at a certain height. The most common of these are inches of water, inches of mercury, millimeters of mercury, and microns of mercury. Conversion factors are listed below. 14.7 psia = 408 inches of water 14.7 psia = 29.9 inches of mercury 1 inch of mercury = 25.4 millimeters of mercury 1 millimeter of mercury = 10³ microns of mercury Rev. 0 Page 11 HT-01

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