Thermodynamics TEMPERATURE AND PRESSURE MEASUREMENTSExample 2: Pressure RelationshipsWhat is the absolute pressure at the bottom of a swimming pool 6 feet deep that is filledwith fresh water? Patm = 14.7 psiaSolution:Pabs= Patm + Pgauge= 14.7 + rH= 14.7 + [(62.4 lbm/ft3)(6 ft)/(144 in.2/ft2)]= 14.7 + 2.6Pabs= 17.3 psiaIn addition to pounds per square inch, pressure can be measured with reference to the force thatexists 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 listedbelow.14.7 psia = 408 inches of water14.7 psia = 29.9 inches of mercury1 inch of mercury = 25.4 millimeters of mercury1 millimeter of mercury = 103 microns of mercuryRev. 0 Page 11 HT-01
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