PRESSURE Type your value in a box, then hit the tab key.
Metric Pascal
  Millibar
Kilopascal
Bar

Mercury   Inch of mercury  
  Centimeter of mercury
Millimeter of mercury

Water   Inch of water  
  Centimeter of water
Foot of water

Other   Pound per square foot  
  Pound per square inch (psi)
Standard atmosphere
Torr (1 kgf/cm-cm)
Technical atmosphere
(1 kgf/cm-cm)