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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      

 

Pressure units cross reference chart
UNIT barmbarkbar PakPaMPa psiatm.ft.Hd. H2O at 20o C in H2Okg/cm2t/m2 Metres H2O Kilo- metres H2O in.Hg. at 20o C mm.Hg. cm.Hg.
1 bar 110000.001 1051000.1 14.5030.987033.514 402.1641.020010 10.21100.01021129.625 752.47075.247
1 mbar 0.001110-6 1000,110-4
1 kbar 10001061 108105100
1 Pa 10-50.0110-8 10.00110-6
1 kPa 0.011010-5 100010.001
1 MPa 101040.01 10610001
1 psi 0.069068.947 6.895 10.06802.310 27.7200.07000.7 0.7040.0007042.043 51.8845.188
1 atm. 1.01301013.0 101.325 14.569133.659 407.5131.033010.3 10.3510.01035130.019 762.48076.248
1 ft.Hd. H2O at 20o C 0.030029.837 2.984 0.4330.02901 12.0000.03000.3 0.3050.0003050.884 22.4522.245
1 in H2O 0.00252.486 0.249 0.0360.00250.833 10.00250.025 0.0250.0000250.074 1.8710.187
1 kg/cm2 0.9810980.662 98.066 14.2330.968032.867 394.408110.0 10.0180.01001829.054 737.95973.796
1 t/m2 1
1 Metre H2O 0.098098.066 9.807 1.4220.09703.287 39.3790.09901.0 10.0010002.905 73.7967.379
1 Kilo- metre H2O 1
1 in.Hg. at 20oC 0.034033.753 3.375 0.4890.03301.131 13.5750.03400.340 0.3400.0003401 25.4002.540
1 mm.Hg. 0.00101.329 0.133 0.0190.00130.045 0.5340.00140.014 0.01360.0000140.039 10.100
1 cm.Hg. 0.013313.290 1.328 0.1930.01310.445 5.3400.01400.140 0.1360.0001360.393 10.0001
UNIT barmbarkbar PakPaMPa psiatm.ft.Hd. H2O at 20o C in H2Okg/cm2t/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 2.525 250.025
timber 8.5 1200 85850 8500.850
brick- work 1.2 170 12120 1200.120
con- crete 8 1120 80800 8000.800
steel 140 20000 140014000 1400014

 

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.

 

Force (weight) per unit area or pressure or stress
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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