Commonly Used Prefixed Versions
| Unit | Symbol | m2 | cm2 |
|---|---|---|---|
| megabarn | Mb | 10−22 | 10−18 |
| kilobarn | kb | 10−25 | 10−21 |
| barn | b | 10−28 | 10−24 |
| millibarn | mb | 10−31 | 10−27 |
| microbarn | μb | 10−34 | 10−30 |
| nanobarn | nb | 10−37 | 10−33 |
| picobarn | pb | 10−40 | 10−36 |
| femtobarn | fb | 10−43 | 10−39 |
| attobarn | ab | 10−46 | 10−42 |
| zeptobarn | zb | 10−49 | 10−45 |
| yoctobarn | yb | 10−52 | 10−48 |
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