What scale is used to measure air pressure?

Air pressure is expressed using a variety of measures including

atm (atmospheres)

Torr (1 atm = 760 Torr)

pounds force per square inch (1 atm = 14.6959 psi)

mm Hg (1 atm = 760 mm Hg = 760 Torr)

inches Hg (1 atm = 29.9213 in-Hg)

pascal (1 atm = 101325 Pa)

kilopascal (1 atm = 101.325 kPa)

bar (1 atm = 1.01325 bar)