| barn | 1 b | 2 b | 3 b | 4 b | 5 b | 6 b | 7 b | 8 b | 9 b | 10 b | 11 b | 12 b | 13 b | 14 b | 15 b | 16 b | 17 b | 18 b | 19 b | 20 b | 21 b | 22 b | 23 b | 24 b | 25 b | 26 b | 27 b | 28 b | 29 b | 30 b | 31 b | 32 b | 33 b | 34 b | 35 b | 36 b | 37 b | 38 b | 39 b | 40 b | 41 b | 42 b | 43 b | 44 b | 45 b | 46 b | 47 b | 48 b | 49 b | 50 b | 51 b | 52 b | 53 b | 54 b | 55 b | 56 b | 57 b | 58 b | 59 b | 60 b | 61 b | 62 b | 63 b | 64 b | 65 b | 66 b | 67 b | 68 b | 69 b | 70 b | 71 b | 72 b | 73 b | 74 b | 75 b | 76 b | 77 b | 78 b | 79 b | 80 b | 81 b | 82 b | 83 b | 84 b | 85 b | 86 b | 87 b | 88 b | 89 b | 90 b | 91 b | 92 b | 93 b | 94 b | 95 b | 96 b | 97 b | 98 b | 99 b | 100 b |
| millibarn | 1 000 mb | 2 000 mb | 3 000 mb | 4 000 mb | 5 000 mb | 6 000 mb | 7 000 mb | 8 000 mb | 9 000 mb | 10 000 mb | 11 000 mb | 12 000 mb | 13 000 mb | 14 000 mb | 15 000 mb | 16 000 mb | 17 000 mb | 18 000 mb | 19 000 mb | 20 000 mb | 21 000 mb | 22 000 mb | 23 000 mb | 24 000 mb | 25 000 mb | 26 000 mb | 27 000 mb | 28 000 mb | 29 000 mb | 30 000 mb | 31 000 mb | 32 000 mb | 33 000 mb | 34 000 mb | 35 000 mb | 36 000 mb | 37 000 mb | 38 000 mb | 39 000 mb | 40 000 mb | 41 000 mb | 42 000 mb | 43 000 mb | 44 000 mb | 45 000 mb | 46 000 mb | 47 000 mb | 48 000 mb | 49 000 mb | 50 000 mb | 51 000 mb | 52 000 mb | 53 000 mb | 54 000 mb | 55 000 mb | 56 000 mb | 57 000 mb | 58 000 mb | 59 000 mb | 60 000 mb | 61 000 mb | 62 000 mb | 63 000 mb | 64 000 mb | 65 000 mb | 66 000 mb | 67 000 mb | 68 000 mb | 69 000 mb | 70 000 mb | 71 000 mb | 72 000 mb | 73 000 mb | 74 000 mb | 75 000 mb | 76 000 mb | 77 000 mb | 78 000 mb | 79 000 mb | 80 000 mb | 81 000 mb | 82 000 mb | 83 000 mb | 84 000 mb | 85 000 mb | 86 000 mb | 87 000 mb | 88 000 mb | 89 000 mb | 90 000 mb | 91 000 mb | 92 000 mb | 93 000 mb | 94 000 mb | 95 000 mb | 96 000 mb | 97 000 mb | 98 000 mb | 99 000 mb | 100 000 mb |
A barn (symbol: b) is a unit of area equal to 10−28 m2 (100 fm2). Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to express the cross sections of any scattering process, and is best understood as a measure of the probability of interaction between small particles.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| barn | b | ≡ 10−28 m2 | ≡ 10−28 m2 | Nuclear Physics |
| barns | millibarns | barns | millibarns |
|---|---|---|---|
| 1 | ≡ 1000 | 6 | ≡ 6000 |
| 2 | ≡ 2000 | 7 | ≡ 7000 |
| 3 | ≡ 3000 | 8 | ≡ 8000 |
| 4 | ≡ 4000 | 9 | ≡ 9000 |
| 5 | ≡ 5000 | 10 | ≡ 10000 |
A millibarn (symbol: mb) is a unit of area equal to 10−31 m2.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| millibarn | mb | ≡ 10−31 m2 | ≡ 10−31 m2 | Nuclear Physics |
| millibarns | barns | millibarns | barns |
|---|---|---|---|
| 1 | ≡ 0.001 | 6 | ≡ 0.006 |
| 2 | ≡ 0.002 | 7 | ≡ 0.007 |
| 3 | ≡ 0.003 | 8 | ≡ 0.008 |
| 4 | ≡ 0.004 | 9 | ≡ 0.009 |
| 5 | ≡ 0.005 | 10 | ≡ 0.01 |
| barns | millibarns |
|---|---|
| 1 | ≡ 1 000 |
| 0.001 | ≡ 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |