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Dictionary of Units / Measurements

Pressure or Stress

The S I unit of pressure is the pascal. The units of pressure are defined in the same way as those for stress - force/unit area. To change any of these other units of pressure (or stress) into their equivalent values in pascals use the operation and conversion factor given. Those marked with # are exact. Other values are given to an appropriate degree of accuracy. Measures based on water assume a density of 1 kg/liter - a value which is rarely matched in the real world, though the error is small.

atmospheres            x 101 325 #

bars                   x 100 000 #

centimetres of mercury x 1333.22

centimetres of water   x 98.066 5 #

feet of water          x 2989.066 92 #

hectopascals [hPa]     x 100 #

inches of water        x 249.088 91 #

inches of mercury      x 3386.388

kg-force/sq.centimetre x 98 066.5 #

kg-force/sq.metre      x 9.806 65 #

kilonewton/sq.metre    x 1000 #

kilopascal [kPa]       x 1000 #

kips/sq.inch           x 6 894 760

meganewtons/sq.metre   x 1 000 000 #

metres of water        x 9806.65 #

millibars              x 100 #

 

pascals [Pa]           1

 

millimetres of mercury x 133.322

millimetres of water   x 9.806 65 #

newtons/sq.centimetre  x 10 000

newtons/sq.metre       1

newtons/sq.millimetre  x 1 000 000 #

pounds-force/sq.foot   x 47.880

pounds-force/sq.inch   x 6894.757

poundals/sq.foot       x 1.448 16

tons(UK)-force/sq.foot x 107 252

tons(UK)-force/sq.inch x 15 444 256

tons(US)-force/sq.foot x 95 760

tons(US)-force/sq.inch x 13 789 500

tonnes-force/sq.cm     x 98 066 500 #

tonnes-force/sq.metre  x 9806.65 #

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