Pa torr atm mbar lb/in2 lb/ft2 kg/cm2 mm Hg in Hg ft H2O Pa=N/m² : The Pascal (Pa) is the SI unit, 1 Bar = 10E5.Pa = 101 kPa = 0.1 MPa A pressure of 1 Pa applied on a surface A=1m² generates a force F=1N (1N=1 kg.m.s-²). 1 Torr = 4/3 mbar, =133.3 Pa 1 standard atmosphäre, 1 atm. = 760 Torr = 1013 mbar 1 tech. atmosphere, 1 At = 1kp/cm² = 981 mbar das relative Vakuum in %: V% = (Po-P)/Po, 300mbar => (1013-300)/1013= 70% Vakuum or P=Po-(Po.V%), 30% in Torr => 760-(760.0.3)=532 Torr atmospheric pressure (1 Atm.) = 1.013 bar, =1013 millibars (mbar), = 101325 Pascal (Pa); =101 kPa = 760 millimeters of mercury absolute (mmHgA) = 760 Torr (1 Torr = 1 mm HgA) = 29.92 inches of mercury absolute ("HgA), = 14.7 pounds per square inch absolute (lb/in², PSIA)