| attobarn | 1 ab | 2 ab | 3 ab | 4 ab | 5 ab | 6 ab | 7 ab | 8 ab | 9 ab | 10 ab | 11 ab | 12 ab | 13 ab | 14 ab | 15 ab | 16 ab | 17 ab | 18 ab | 19 ab | 20 ab | 21 ab | 22 ab | 23 ab | 24 ab | 25 ab | 26 ab | 27 ab | 28 ab | 29 ab | 30 ab | 31 ab | 32 ab | 33 ab | 34 ab | 35 ab | 36 ab | 37 ab | 38 ab | 39 ab | 40 ab | 41 ab | 42 ab | 43 ab | 44 ab | 45 ab | 46 ab | 47 ab | 48 ab | 49 ab | 50 ab | 51 ab | 52 ab | 53 ab | 54 ab | 55 ab | 56 ab | 57 ab | 58 ab | 59 ab | 60 ab | 61 ab | 62 ab | 63 ab | 64 ab | 65 ab | 66 ab | 67 ab | 68 ab | 69 ab | 70 ab | 71 ab | 72 ab | 73 ab | 74 ab | 75 ab | 76 ab | 77 ab | 78 ab | 79 ab | 80 ab | 81 ab | 82 ab | 83 ab | 84 ab | 85 ab | 86 ab | 87 ab | 88 ab | 89 ab | 90 ab | 91 ab | 92 ab | 93 ab | 94 ab | 95 ab | 96 ab | 97 ab | 98 ab | 99 ab | 100 ab |
| barn | 1.0 × 10-18 b | 2.0 × 10-18 b | 3.0 × 10-18 b | 4.0 × 10-18 b | 5.0 × 10-18 b | 6.0 × 10-18 b | 7.0 × 10-18 b | 8.0 × 10-18 b | 9.0 × 10-18 b | 1.0 × 10-17 b | 1.1 × 10-17 b | 1.2 × 10-17 b | 1.3 × 10-17 b | 1.4 × 10-17 b | 1.5 × 10-17 b | 1.6 × 10-17 b | 1.7 × 10-17 b | 1.8 × 10-17 b | 1.9 × 10-17 b | 2.0 × 10-17 b | 2.1 × 10-17 b | 2.2 × 10-17 b | 2.3 × 10-17 b | 2.4 × 10-17 b | 2.5 × 10-17 b | 2.6 × 10-17 b | 2.7 × 10-17 b | 2.8 × 10-17 b | 2.9 × 10-17 b | 3.0 × 10-17 b | 3.1 × 10-17 b | 3.2 × 10-17 b | 3.3 × 10-17 b | 3.4 × 10-17 b | 3.5 × 10-17 b | 3.6 × 10-17 b | 3.7 × 10-17 b | 3.8 × 10-17 b | 3.9 × 10-17 b | 4.0 × 10-17 b | 4.1 × 10-17 b | 4.2 × 10-17 b | 4.3 × 10-17 b | 4.4 × 10-17 b | 4.5 × 10-17 b | 4.6 × 10-17 b | 4.7 × 10-17 b | 4.8 × 10-17 b | 4.9 × 10-17 b | 5.0 × 10-17 b | 5.1 × 10-17 b | 5.2 × 10-17 b | 5.3 × 10-17 b | 5.4 × 10-17 b | 5.5 × 10-17 b | 5.6 × 10-17 b | 5.7 × 10-17 b | 5.8 × 10-17 b | 5.9 × 10-17 b | 6.0 × 10-17 b | 6.1 × 10-17 b | 6.2 × 10-17 b | 6.3 × 10-17 b | 6.4 × 10-17 b | 6.5 × 10-17 b | 6.6 × 10-17 b | 6.7 × 10-17 b | 6.8 × 10-17 b | 6.9 × 10-17 b | 7.0 × 10-17 b | 7.1 × 10-17 b | 7.2 × 10-17 b | 7.3 × 10-17 b | 7.4 × 10-17 b | 7.5 × 10-17 b | 7.6 × 10-17 b | 7.7 × 10-17 b | 7.8 × 10-17 b | 7.9 × 10-17 b | 8.0 × 10-17 b | 8.1 × 10-17 b | 8.2 × 10-17 b | 8.3 × 10-17 b | 8.4 × 10-17 b | 8.5 × 10-17 b | 8.6 × 10-17 b | 8.7 × 10-17 b | 8.8 × 10-17 b | 8.9 × 10-17 b | 9.0 × 10-17 b | 9.1 × 10-17 b | 9.2 × 10-17 b | 9.3 × 10-17 b | 9.4 × 10-17 b | 9.5 × 10-17 b | 9.6 × 10-17 b | 9.7 × 10-17 b | 9.8 × 10-17 b | 9.9 × 10-17 b | 1.0 × 10-16 b |
A attobarn (symbol: ab) is a unit of area equal to 10−46 m2.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| attobarn | ab | ≡ 10−46 m2 | ≡ 10−46 m2 | Nuclear Physics |
| attobarns | barns | attobarns | barns |
|---|---|---|---|
| 1 | ≡ 1.0E-18 | 6 | ≡ 6.0E-18 |
| 2 | ≡ 2.0E-18 | 7 | ≡ 7.0E-18 |
| 3 | ≡ 3.0E-18 | 8 | ≡ 8.0E-18 |
| 4 | ≡ 4.0E-18 | 9 | ≡ 9.0E-18 |
| 5 | ≡ 5.0E-18 | 10 | ≡ 1.0E-17 |
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 | attobarns | barns | attobarns |
|---|---|---|---|
| 1 | ≡ 1.0E+18 | 6 | ≡ 6.0E+18 |
| 2 | ≡ 2.0E+18 | 7 | ≡ 7.0E+18 |
| 3 | ≡ 3.0E+18 | 8 | ≡ 8.0E+18 |
| 4 | ≡ 4.0E+18 | 9 | ≡ 9.0E+18 |
| 5 | ≡ 5.0E+18 | 10 | ≡ 1.0E+19 |
| attobarns | barns |
|---|---|
| 1 | ≡ 1.0 × 10-18 |
| 1.0 × 1018 | ≡ 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 …) |