The bar is a unit of pressure, equal to 100,000 Pa. The bar is not an SI unit, but is accepted for use with SI by BIPM - The International Bureau of Weights and Measures.[1] The bar is convenient as it is quite close to the value of the standard atmosphere (1.01325 bar). Additionally, bar as a unit of measurement is useful as it is often used when describing pressures under water or underground.


For Further Reading


  1. Bureau International des Poids et Mesures (2006), The International System of Units (SI) 8th ed., pp. 127

Authors and Editors

Allison Campbell, Chad Erhardt, Jordan Hanania, Braden Heffernan, James Jenden, Kailyn Stenhouse, Jason Donev
Last updated: September 3, 2018
Get Citation