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2.33 Pressure units cross reference chart

# Pressure units cross reference chart

von Frank L. Preuss

Force (weight) per unit area or pressure or stress.

1 Pa = 1 N/m2       1 kPa = 1 kN/m2       1 MPa = 1 MN/m2       1 kgf = 9.806 65 N

 UNIT bar mbar kbar Pa kPa MPa psi atm. ft.Hd. H2O at 20o C in H2O kg/cm2 t/m2 Metres H2O Kilo- metres H2O in.Hg. at 20o C mm.Hg. cm.Hg. 1 bar 1 1000 0.001 105 100 0.1 14.503 0.9870 33.514 402.164 1.0200 10 10.2110 0.010211 29.625 752.470 75.247 1 mbar 0.001 1 10-6 100 0,1 10-4 1 kbar 1000 106 1 108 105 100 1 Pa 10-5 0.01 10-8 1 0.001 10-6 1 kPa 0.01 10 10-5 1000 1 0.001 1 MPa 10 104 0.01 106 1000 1 1 psi 0.0690 68.947 6.895 1 0.0680 2.310 27.720 0.0700 0.7 0.704 0.000704 2.043 51.884 5.188 1 atm. 1.0130 1013.0 101.325 14.569 1 33.659 407.513 1.0330 10.3 10.351 0.010351 30.019 762.480 76.248 1 ft.Hd. H2O at 20o C 0.0300 29.837 2.984 0.433 0.0290 1 12.000 0.0300 0.3 0.305 0.000305 0.884 22.452 2.245 1 in H2O 0.0025 2.486 0.249 0.036 0.0025 0.833 1 0.0025 0.025 0.025 0.000025 0.074 1.871 0.187 1 kg/cm2 0.9810 980.662 98.066 14.233 0.9680 32.867 394.408 1 10.0 10.018 0.010018 29.054 737.959 73.796 1 t/m2 1 1 Metre H2O 0.0980 98.066 9.807 1.422 0.0970 3.287 39.379 0.0990 1.0 1 0.001000 2.905 73.796 7.379 1 Kilo- metre H2O 1 1 in.Hg. at 20oC 0.0340 33.753 3.375 0.489 0.0330 1.131 13.575 0.0340 0.340 0.340 0.000340 1 25.400 2.540 1 mm.Hg. 0.0010 1.329 0.133 0.019 0.0013 0.045 0.534 0.0014 0.014 0.0136 0.000014 0.039 1 0.100 1 cm.Hg. 0.0133 13.290 1.328 0.193 0.0131 0.445 5.340 0.0140 0.140 0.136 0.000136 0.393 10.000 1 UNIT bar mbar kbar Pa kPa MPa psi atm. ft.Hd. H2O at 20o C in H2O kg/cm2 t/m2 Metres H2O Kilo- metres H2O in.Hg. at 20o C mm.Hg. cm.Hg. Examples of stress in loaded materials: ground 0.25 35 2.5 25 25 0.025 timber 8.5 1200 85 850 850 0.850 brick- work 1.2 170 12 120 120 0.120 con- crete 8 1120 80 800 800 0.800 steel 140 20000 1400 14000 14000 14

atmospheric pressure (Phys.). The pressure exerted by the atmosphere at the surface of the earth is due to the weight of the air. Its standard value is 1.01325 x 105 N/m2, or 14.7 lbf/in2. Variations in the atmospheric pressure are measured by means of the barometer.

bar (Meteor.,Phys.). Unit of pressure or stress, 1 bar = 105 N/m2 or pascals = 750.07 mm of mecury at 0oC and lat. 45o. The millibar (1 mbar = 100 N/m2 or 103 dyn/cm2) is used for barometric purposes. (N.B. Std. atmos. pressure = 1.01325 bar.) The hectobar (1 hbar = 107 N/m2, approx. 0.6475 tonf/in2) is used for some engineering purposes.

H2O Hydrogen oxide - water.

Hg (Chem.). The symbol for mercury.

lb (Genrl.). Abbrev. for pound.

newton (Elec.Eng.). Symbol N. The unit of force in the SI system, being the force required to impart, to a mass of 1 kg, an acceleration of 1 m/sec2. 1 newton = 0.2248 pounds force.

pascal (Genrl.). The SI derived unit of pressure or stress, equals 1 newton per square metre. abbrev. Pa.

pound (Genrl.). The unit of mass in the old UK system of units established by the Weights and Meassures Act, 1856, and until 1963 defined as the mass of the Imperial Standard Pound, a platinum cylinder kept at the Board of Trade. In 1963, it was redefined as 0.453 592 37 kg. The US pound is defined as 0.453 592 427 7kg.

 1 pdl/ft2 = 1.488 16 N/m2 1 lbf/ft2 = 47.8803 N/m2 1 mm Hg = 133.322 N/m2 1 in. H2O = 249.089 N/m2 1 ft H2O = 2989.07 N/m2 = 0.029 890 7 bar 1 in. Hg = 3386.39 N/m2 = 0.033 863 9 bar 1 lbf/in.2 = 6.894 76 kN/m2 = 0.068 947 6 bar 1 bar = 105 N/m2 1 std. atmos. = 101.325 kN/m2 = 1.013 25 bar 1 ton/ft2 = 107.252 kN/m2 1 tonf/in.2 = 15.4443 MN/m2 = 1.544 43 hectobar

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