1. (noun) a unit measuring force per unit area

• atm
• atmosphere
• standard atmosphere
• standard pressure
• bar
• bar absolute
• barye
• microbar
• millibar
• millimeter of mercury
• mm hg
• torr
• pa
• pascal
• pounds per square inch
• psi

1. (noun) a unit measuring force per unit area

• unit
• unit of measurement