Schmalz

Measurement Units of Vacuum Data

The units pascal [Pa], kilopascal [kPa], bar [bar] and millibar [mbar] are most widely used in vacuum technology as units for pressure. The units are converted as follows:

0.001 bar = 0.1 kPa = 1 mbar = 100 Pa

On this website, all absolute pressure values are given in bar or mbar, all relative values in %. The % value is typical for a relative indication of the efficiency of a vacuum generator. Other units are used internationally. Some of them are included in the following table.

Vacuum/pressure conversion table

  bar N/cm2 kPa atm, kp/cm2   mm H2O Torr; mm Hg   in Hg
bar 1.00000  10.00000   100.0000   1.01970 10,197.00  750.0600 29.5400
N/cm2 0.10000 1.00000 10.0000 0.10190 1,019.70 75.0060 2.9540
kPa 0.01000 0.10000 1.0000 0.01020 101.97 7.5006 0.2954
atm, kp/cm2   0.98070 9.80700   98.0700 1.00000 10,332.00   735.5600 28.9700
mm H2O 0.00010 0.00100 0.0100 0.00009 1.00 0.0740 0.0030
Torr; mm Hg 0.00133 0.01333 0.1333 0.00136 13.60 1.0000 0.0394
in Hg 0.03380 0.33850 3.8850 0.03446 345.40 25.2500 1.0000

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