30in is 762000 microns of vacuum
If your talking about vacuum 500 microns of Hg is lower.
vacuum is measured in pressure. To get a vacuum you need a negative pressure. that would be inches of mercury hg
Typically, it is recommended to pull a vacuum on a refrigeration unit down to 500 microns or lower to ensure that moisture and non-condensable gases are removed, preventing any potential issues with the system in the future.
Deep vacuum is usually measured in microns. This unit of measurement is commonly used in vacuum technology to indicate levels of pressure or vacuum.
10 Microns.
109 microns 1.000.000.000 microns
To suck-in dirt.
Vacuum cleaner
914400 microns
1mm is 1000 microns
1000 microns