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

 Unit bar N/cm2 kPa atm,

kp/cm2

 mm H2O
bar 1.00000 10.00000 100.0000 1.01970 10,197.00
N/cm2 0.10000 1.00000 10.0000 0.10190 1,019.70
kPa 0.01000 0.10000 1.0000 0.01020 101.97
atm, kp/cm2   0.98070 9.80700 98.0700 1.00000 10,332.00
mm H2O 0.00010 0.00100 0.0100 0.00000 1.00
Torr; mm Hg 0.00133 0.01333 0.1333 0.00136 13.60
in Hg 0.03380 0.33850 3.8850 0.03446 345.40

 

Credits : https://www.schmalz.com/en/