- Torr, mtorr, microns, PSI-A, Bar, mbar, kPa, Pa and ATM are in absolute units
- PSI-G, In H2O, In Hg are in gauge or differential from Atmosphere
- Atmospheric pressure for differential calculations is locked at 760 Torr in this table, although varies on any day with weather, altitude and temperature
- 760Torr = 0 inches of Hg and 0 inches of H20
- 1 Atmosphere stated at standard temperature and pressure
