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Pressure Conversions

Pressure is defined as force per unit area applied to an object in a direction perpendicular to the surface.

The table below presents conversion factors between common units of force.

Standard units = Pascal (P)

  atmosphere inch of water lb per sq in lb per sq ft cm of Hg dyn/cm2 pascal
1 atm = 1 406.8 14.70 2116 75.99 1.013 * 106 1.013 * 105
1 in water = 2.458 * 10-3 1 3.613 * 10-2 5.202 0.1868 2491 249.1
1 lb/in2 = 6.805 * 10-2 27.68 1 144 5.171 6.895 * 104 6.895 * 103
1 lb/ft2 = 4.725 * 10-4 0.1922 6.944 * 10-3 1 3.591x10-2 478.8 47.88
1 cm Hg = 1.316 * 10-2 5.353 0.1934 27.85 1 1.333 * 104 1333
1 dyn/cm2 = 9.869 * 10-7 4.015 * 10-4 1.450 * 10-5 2.089 * 10-3 7.501 * 10-5 1 0.1
1 Pa = 9.869 * 10-6 4.015 * 10-3 1.450 * 10-4 2.089 * 10-2 7.501 * 10-4 10 1

in of water @ 4º C 1 bar = 106 dyn/cm2
cm of Hg @ 0º C 1 atm = 29.92 in of Hg

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