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Engineering Specs Pressure Equivalents Temperature Conversion 1 psi = 27 .7 inches w .g . °F = (°C x 1 .8) + 32 1 psi = 2 .04 inches of mercury (Hg) °C = 0 .555 (°F - 32) 1 inch of mercury (Hg) = 13 .6 inches w .g . Temperature Conversion Table 1 inch of mercury (Hg) = 0 .491 psi Inch/Metric Size °F °C Conversion Table -65 -53 .9 Inches cm mm -40 -40 .0 1 .00 2 .5 25 .4 -20 -28 .9 1 .25 3 .2 31 .8 0 -17 .8 1 .50 3 .8 38 .1 20 -6 .7 2 .00 5 .1 50 .8 32 0 .0 Inches Inches Lbs . Per 2 .36 6 .0 60 .0 40 4 .4 Mercury Water Square In . 2 .50 6 .4 63 .5 60 15 .6 29 394 .4 14 .2 2 .95 7 .5 75 .0 80 26 .7 26 353 .6 12 .7 3 .00 7 .6 76 .2 100 37 .8 24 326 .4 11 .8 3 .94 10 .0 100 .0 125 51 .7 22 299 .2 10 .8 Inches Inches Lbs . Per 4 .00 10 .2 101 .6 150 65 .6 Water Mercury Square In . 20 272 .0 9 .8 4 .72 12 .0 120 .0 175 79 .4 100 7 .35 3 .61 18 244 .8 8 .8 5 .00 12 .7 127 .0 200 93 .3 90 6 .62 3 .25 16 217 .6 7 .8 6 .00 15 .2 152 .4 212 100 .0 80 5 .88 2 .89 14 190 .4 6 .9 6 .30 16 .0 160 .0 225 107 .2 70 5 .15 2 .53 12 163 .2 5 .9 7 .00 17 .8 177 .8 250 121 .1 60 4 .41 2 .17 10 136 .0 4 .9 7 .09 18 .0 180 .0 300 148 .9 50 3 .68 1 .81 8 108 .8 3 .9 8 .00 20 .3 203 .2 325 162 .8 40 2 .94 1 .44 6 81 .6 2 .9 10 .00 25 .4 254 .0 350 176 .7 30 2 .21 1 .08 4 54 .4 2 .0 12 .00 30 .5 304 .8 400 204 .4 20 1 .47 0 .72 2 27 .2 1 .0 14 .00 35 .6 355 .6 450 232 .2 10 0 .74 0 .36 1 13 .6 0 .5 16 .00 40 .6 406 .4 500 260 .0 0 0 .00 0 .00 0 .5 6 .8 0 .25 18 .00 45 .7 457 .2 550 287 .8 All data based on average approximation . tel 800-343-0428 · fax 800-382-8464