Gauge PSI, Absolute pressure PSI, Vacuum Inches Mercury, Vacuum millibar, vacuum kPa, Absolute pressure Torr, Gauge Vacuum mm mercury and percentage vacuum cross reference guide. ### Altitude feet, Altitude meters, absolute pressure and gauge pressure inches mercury vacuum conversion table #### Vacuum pressure unit conversion chart (absolute)

Convert percentage vacuum, atmospheres, PSIA, Torr (millimeters mercury mm Hg), Inches mercury In Hg, kPa (SI Unit), bar and mbar. #### Vacuum pressure unit conversions chart (relative)

Percentage vacuum, atmosphere ATM, PSIG negative gauge pressure, Inches Mercuury negative gauge, kPa negative gauge, bar negative gauge and millimbar mbat negative gauge conversions. #### Find valves suitable for vaccum.

Pascal (Pa)
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 atmosphere, 1 atm. = 760 Torr = 1013 mbar
1 tech. atmosphere, 1 At = 1kp/cm² = 981 mbar

That relative Vacuum in %: V% = (Po-P)/Po, 300mbar => (1013-300)/1013= 70% Vacuum
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 Millimetre mercury column (mmHgA) = 760 Torr (1 Torr = 1 mm HgA)
= 29.92 inches of mercury absolute (in HgA),
= 14.7 pounds per square inch absolute (lb/in², PSIA)

Atmospheric pressure is often measured with a mercury barometer, and a height of approximately 760 millimetres (30 in) of mercury is often used to illustrate (and measure) atmospheric pressure. However, since mercury is not a substance that humans commonly come in contact with, water often provides a more intuitive way to visualize the pressure of one atmosphere:

One atmosphere (101 kPa or 14.7 psi) is the amount of pressure that can lift water approximately 10.3 m (34 ft).

10.3 m (34 ft) is also the maximum height to which a column of water can be drawn up by suction / via a vacuum.