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 |
DefinitionThe 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.