Metric units

bar
kilopascal (kPa)
hectopascal (hPa)
megapascal (MPa)
millibar
pascal (Pa)
kilogram of force per square centimeter (kgf/cm2)
kilogram of force per square meter (kgf/m2)
newton per square meter (N/m2)
kilonewton per square meter (kN/m2)
meganewton per square meter (MN/m2)
newton per square centimeter (N/cm2)
newton per square millimeter (N/mm2)

Atmosphere

physical atmosphere (atm)
technical atmosphere (at)

British and American units

1000 pound per square foot (ksi)
pound per square inch (psi)
pound per square foot
ton of force per square inch
ton of force per square foot
british ton of force per square inch
british ton of force per square foot

Mercury column units

inch of mercury column
centimeter of mercury column
millimeter of mercury (torr)

Water (at 4oC, 39.2oF)

water column meter
centimeter of water column
foot of water column
inch of water column