HVAC Know It All - After a recent conversation regarding vacuums and units of measure I found this handy conversion table. 1" Hg Absolute is equal to about roughly 1/2 PSIA. Pressure
Vacuum Conversion Table | PDF | Pressure | Physical Quantities
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Vacuum Pressure Unit Conversions Chart From Ism | PDF | Pressure | Pascal (Unit)
Vacuum Measurement: A Basic Guide - Fluid Power Journal