Units of Pressure Unit Abbreviation Description
[Pages:1]Units of Pressure
Unit Atmosphere
Abbreviation Atm
Torr
Torr
Inches of Mercury
Hg
Millibar
mb
Pascal
Pa
Megapascal
MPa
Pounds per Square Inch
Psi
Pounds per Square Inch Psig (,,gauge" corrected)
Description
Standard sea level pressure
760 torr, 1,013.25 mb,
101,325 Pa, about 14.7 psi
1 mm of Mercury (760 torr =
1 Atm), about 1.33 mb, about
6,895 Pa, about .0193 psi*
256 mm of Mercury 1/1000 of a bar, about .000987 atm, about .75 torr, 100 Pa, about .0145 psi about .00000987 atm, about .0075 torr, .01 mb, about .000145 psi about 9.87 atm
about .068 atm, about 51.7 torr, about 68.95 mb, about 6,895 Pa see comment below
NOTE: with many types of gauges, one obtains a reading of "0" (zero) when there is one atmosphere inside the vessel. In other words, if the gauge reads (in whatever units) one atmosphere, the reaction is actually being conducted under a total of two atmospheres. In the case of psi units, the abbreviation psig is used whan one simply reports the gauge pressure and doesn't want to think deeply about how many atmospheres this really means (it really means the gauge reading plus one atmosphere).
adapted from pressureunits
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