| square chain (international) | 1 sq ch | 2 sq ch | 3 sq ch | 4 sq ch | 5 sq ch | 6 sq ch | 7 sq ch | 8 sq ch | 9 sq ch | 10 sq ch | 11 sq ch | 12 sq ch | 13 sq ch | 14 sq ch | 15 sq ch | 16 sq ch | 17 sq ch | 18 sq ch | 19 sq ch | 20 sq ch | 21 sq ch | 22 sq ch | 23 sq ch | 24 sq ch | 25 sq ch | 26 sq ch | 27 sq ch | 28 sq ch | 29 sq ch | 30 sq ch | 31 sq ch | 32 sq ch | 33 sq ch | 34 sq ch | 35 sq ch | 36 sq ch | 37 sq ch | 38 sq ch | 39 sq ch | 40 sq ch | 41 sq ch | 42 sq ch | 43 sq ch | 44 sq ch | 45 sq ch | 46 sq ch | 47 sq ch | 48 sq ch | 49 sq ch | 50 sq ch | 51 sq ch | 52 sq ch | 53 sq ch | 54 sq ch | 55 sq ch | 56 sq ch | 57 sq ch | 58 sq ch | 59 sq ch | 60 sq ch | 61 sq ch | 62 sq ch | 63 sq ch | 64 sq ch | 65 sq ch | 66 sq ch | 67 sq ch | 68 sq ch | 69 sq ch | 70 sq ch | 71 sq ch | 72 sq ch | 73 sq ch | 74 sq ch | 75 sq ch | 76 sq ch | 77 sq ch | 78 sq ch | 79 sq ch | 80 sq ch | 81 sq ch | 82 sq ch | 83 sq ch | 84 sq ch | 85 sq ch | 86 sq ch | 87 sq ch | 88 sq ch | 89 sq ch | 90 sq ch | 91 sq ch | 92 sq ch | 93 sq ch | 94 sq ch | 95 sq ch | 96 sq ch | 97 sq ch | 98 sq ch | 99 sq ch | 100 sq ch |
| barn | 4.0468564224 × 1030 b | 8.0937128448 × 1030 b | 1.21405692672 × 1031 b | 1.61874256896 × 1031 b | 2.0234282112 × 1031 b | 2.42811385344 × 1031 b | 2.83279949568 × 1031 b | 3.23748513792 × 1031 b | 3.64217078016 × 1031 b | 4.0468564224 × 1031 b | 4.45154206464 × 1031 b | 4.85622770688 × 1031 b | 5.26091334912 × 1031 b | 5.66559899136 × 1031 b | 6.0702846336 × 1031 b | 6.47497027584 × 1031 b | 6.87965591808 × 1031 b | 7.28434156032 × 1031 b | 7.68902720256 × 1031 b | 8.0937128448 × 1031 b | 8.49839848704 × 1031 b | 8.90308412928 × 1031 b | 9.30776977152 × 1031 b | 9.71245541376 × 1031 b | 1.0117141056 × 1032 b | 1.052182669824 × 1032 b | 1.092651234048 × 1032 b | 1.133119798272 × 1032 b | 1.173588362496 × 1032 b | 1.21405692672 × 1032 b | 1.254525490944 × 1032 b | 1.294994055168 × 1032 b | 1.335462619392 × 1032 b | 1.375931183616 × 1032 b | 1.41639974784 × 1032 b | 1.456868312064 × 1032 b | 1.497336876288 × 1032 b | 1.537805440512 × 1032 b | 1.578274004736 × 1032 b | 1.61874256896 × 1032 b | 1.659211133184 × 1032 b | 1.699679697408 × 1032 b | 1.740148261632 × 1032 b | 1.780616825856 × 1032 b | 1.82108539008 × 1032 b | 1.861553954304 × 1032 b | 1.902022518528 × 1032 b | 1.942491082752 × 1032 b | 1.982959646976 × 1032 b | 2.0234282112 × 1032 b | 2.063896775424 × 1032 b | 2.104365339648 × 1032 b | 2.144833903872 × 1032 b | 2.185302468096 × 1032 b | 2.22577103232 × 1032 b | 2.266239596544 × 1032 b | 2.306708160768 × 1032 b | 2.347176724992 × 1032 b | 2.387645289216 × 1032 b | 2.42811385344 × 1032 b | 2.468582417664 × 1032 b | 2.509050981888 × 1032 b | 2.549519546112 × 1032 b | 2.589988110336 × 1032 b | 2.63045667456 × 1032 b | 2.670925238784 × 1032 b | 2.711393803008 × 1032 b | 2.751862367232 × 1032 b | 2.792330931456 × 1032 b | 2.83279949568 × 1032 b | 2.873268059904 × 1032 b | 2.913736624128 × 1032 b | 2.954205188352 × 1032 b | 2.994673752576 × 1032 b | 3.0351423168 × 1032 b | 3.075610881024 × 1032 b | 3.116079445248 × 1032 b | 3.156548009472 × 1032 b | 3.197016573696 × 1032 b | 3.23748513792 × 1032 b | 3.277953702144 × 1032 b | 3.318422266368 × 1032 b | 3.358890830592 × 1032 b | 3.399359394816 × 1032 b | 3.43982795904 × 1032 b | 3.480296523264 × 1032 b | 3.520765087488 × 1032 b | 3.561233651712 × 1032 b | 3.601702215936 × 1032 b | 3.64217078016 × 1032 b | 3.682639344384 × 1032 b | 3.723107908608 × 1032 b | 3.763576472832 × 1032 b | 3.804045037056 × 1032 b | 3.84451360128 × 1032 b | 3.884982165504 × 1032 b | 3.925450729728 × 1032 b | 3.965919293952 × 1032 b | 4.006387858176 × 1032 b | 4.0468564224 × 1032 b |
square chain is a unit of area.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| square chain (international) | sq ch | ≡ 66 ft × 66 ft = 1⁄10 ac | ≡ 404.68564224 m2 | Imperial/US |
| square chains (international) | barns | square chains (international) | barns |
|---|---|---|---|
| 1 | ≡ 4.0468564224E+30 | 6 | ≡ 2.42811385344E+31 |
| 2 | ≡ 8.0937128448E+30 | 7 | ≡ 2.83279949568E+31 |
| 3 | ≡ 1.21405692672E+31 | 8 | ≡ 3.23748513792E+31 |
| 4 | ≡ 1.61874256896E+31 | 9 | ≡ 3.64217078016E+31 |
| 5 | ≡ 2.0234282112E+31 | 10 | ≡ 4.0468564224E+31 |
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 | square chains (international) | barns | square chains (international) |
|---|---|---|---|
| 1 | ≡ 2.4710538146717E-31 | 6 | ≡ 1.482632288803E-30 |
| 2 | ≡ 4.9421076293433E-31 | 7 | ≡ 1.7297376702702E-30 |
| 3 | ≡ 7.413161444015E-31 | 8 | ≡ 1.9768430517373E-30 |
| 4 | ≡ 9.8842152586866E-31 | 9 | ≡ 2.2239484332045E-30 |
| 5 | ≡ 1.2355269073358E-30 | 10 | ≡ 2.4710538146717E-30 |
| square chains (international) | barns |
|---|---|
| 1 | ≡ 4.0468564224 × 1030 |
| 2.4710538146717 × 10-31 | ≡ 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 …) |