barn

barn

Non-SI unit
Name Symbol Quantity Expressed in terms of SI base units Expressed in terms of other SI units
barn b area 10−28 m2 100 fm2
(10−12 cm)2

Definition

The barn, symbol b, is a non-SI unit of area. One barn is equal to 10−28 m2, or 100 fm2.

Particle physics

The barn is a non-SI unit of cross-section used in nuclear and particle interactions.