Full name: barn
Plural form: barns
Category type: area
Scale factor: 1.0E-28
The SI derived unit for area is the square meter.
1 square meter is equal to 1.0E+28 barn.
Valid units must be of the area type.
You can use this form to select from known units:
A barn is a unit of area, abbreviated mostly as "bn", equal to 10-28 m2. Although not an official SI unit, it is widely used by nuclear physicists, since it is convenient for expressing the cross sectional area of nuclei and nuclear reactions. A barn is approximately equal to the area of a uranium nucleus.