Hg Vacuum To Hg Absolute

Vacuum is given as absolute pressure and pressure below standard atmospheric pressure 1 bara 0 vacuum.

Hg vacuum to hg absolute. Vacuum torr mm mercury micron psia lb in 2 abs inches mercury absolute inches mercury gauge kpa abs. Other vacuum units are atmospheres torr and micrometers. Most pressure measuring devices however are calibrated to read zero in the atmosphere and so they indicate the difference between the absolute pressure and the local atmospheric pressure. Absolute pressure would include the atmospheric barometric pressure at the location of the measurement with the respective gage pressure added or subtracted.

The actual pressure at a given position is called the absolute pressure and it is measured relative to absolute vacuum i e absolute zero pressure. 100 mm hg is the same as 760 100 660 mm hg absolute pressure the table shows the water boiling temperature at different vacuum pressure. Mm hg in hg inches mercury kpa si unit bar. To calculate atmospheres divide absolute pressure in psia by 14 7.

Absolute pressure readings start at zero representing absolute zero pressure and read up to 760 representing standard atmospheric pressure in the case of the mms of hg scale. Alternatively you can use our unit converter to calculate the vacuum conversion for all vacuum units. Absolute pressure is the pressure in psia above a perfect vacuum and is equal to atmospheric pressure less negative gauge pressure. As with most pressure gage readings a vaccum expressed in inches of hg would be vacuum gage pressure that is pressure below the atmospheric.

In practice a perfect vacuum is impossible to obtain. For full table with vacuum and water boiling point rotate the screen. Vacuum of e g. Ver 08 aug 2017 vacuum.

Vacuum pressures unit conversions chart absolute perfect vacuum or 100 vacuum is a zero reference pressure. As vacuum pumps became more efficient it also became necessary to have a smaller vacuum measurement unit than the mm of hg.