| 0b | 0mi² |
| 1b | 3.861022 × 10⁻³⁵mi² |
| 2b | 7.722043 × 10⁻³⁵mi² |
| 3b | 1.158307 × 10⁻³⁴mi² |
| 4b | 1.544409 × 10⁻³⁴mi² |
| 5b | 1.930511 × 10⁻³⁴mi² |
| 6b | 2.316613 × 10⁻³⁴mi² |
| 7b | 2.702715 × 10⁻³⁴mi² |
| 8b | 3.088817 × 10⁻³⁴mi² |
| 9b | 3.47492 × 10⁻³⁴mi² |
| 10b | 3.861022 × 10⁻³⁴mi² |
| 11b | 4.247124 × 10⁻³⁴mi² |
| 12b | 4.633226 × 10⁻³⁴mi² |
| 13b | 5.019328 × 10⁻³⁴mi² |
| 14b | 5.40543 × 10⁻³⁴mi² |
| 15b | 5.791533 × 10⁻³⁴mi² |
| 16b | 6.177635 × 10⁻³⁴mi² |
| 17b | 6.563737 × 10⁻³⁴mi² |
| 18b | 6.949839 × 10⁻³⁴mi² |
| 19b | 7.335941 × 10⁻³⁴mi² |
| 20b | 7.722043 × 10⁻³⁴mi² |
| 21b | 8.108146 × 10⁻³⁴mi² |
| 22b | 8.494248 × 10⁻³⁴mi² |
| 23b | 8.88035 × 10⁻³⁴mi² |
| 24b | 9.266452 × 10⁻³⁴mi² |
| 25b | 9.652554 × 10⁻³⁴mi² |
| 26b | 1.003866 × 10⁻³³mi² |
| 27b | 1.042476 × 10⁻³³mi² |
| 28b | 1.081086 × 10⁻³³mi² |
| 29b | 1.119696 × 10⁻³³mi² |
| 30b | 1.158307 × 10⁻³³mi² |
| 31b | 1.196917 × 10⁻³³mi² |
| 32b | 1.235527 × 10⁻³³mi² |
| 33b | 1.274137 × 10⁻³³mi² |
| 34b | 1.312747 × 10⁻³³mi² |
| 35b | 1.351358 × 10⁻³³mi² |
| 36b | 1.389968 × 10⁻³³mi² |
| 37b | 1.428578 × 10⁻³³mi² |
| 38b | 1.467188 × 10⁻³³mi² |
| 39b | 1.505798 × 10⁻³³mi² |
| 40b | 1.544409 × 10⁻³³mi² |
| 41b | 1.583019 × 10⁻³³mi² |
| 42b | 1.621629 × 10⁻³³mi² |
| 43b | 1.660239 × 10⁻³³mi² |
| 44b | 1.69885 × 10⁻³³mi² |
| 45b | 1.73746 × 10⁻³³mi² |
| 46b | 1.77607 × 10⁻³³mi² |
| 47b | 1.81468 × 10⁻³³mi² |
| 48b | 1.85329 × 10⁻³³mi² |
| 49b | 1.891901 × 10⁻³³mi² |
| 50b | 1.930511 × 10⁻³³mi² |
| 51b | 1.969121 × 10⁻³³mi² |
| 52b | 2.007731 × 10⁻³³mi² |
| 53b | 2.046342 × 10⁻³³mi² |
| 54b | 2.084952 × 10⁻³³mi² |
| 55b | 2.123562 × 10⁻³³mi² |
| 56b | 2.162172 × 10⁻³³mi² |
| 57b | 2.200782 × 10⁻³³mi² |
| 58b | 2.239393 × 10⁻³³mi² |
| 59b | 2.278003 × 10⁻³³mi² |
| 60b | 2.316613 × 10⁻³³mi² |
| 61b | 2.355223 × 10⁻³³mi² |
| 62b | 2.393833 × 10⁻³³mi² |
| 63b | 2.432444 × 10⁻³³mi² |
| 64b | 2.471054 × 10⁻³³mi² |
| 65b | 2.509664 × 10⁻³³mi² |
| 66b | 2.548274 × 10⁻³³mi² |
| 67b | 2.586885 × 10⁻³³mi² |
| 68b | 2.625495 × 10⁻³³mi² |
| 69b | 2.664105 × 10⁻³³mi² |
| 70b | 2.702715 × 10⁻³³mi² |
| 71b | 2.741325 × 10⁻³³mi² |
| 72b | 2.779936 × 10⁻³³mi² |
| 73b | 2.818546 × 10⁻³³mi² |
| 74b | 2.857156 × 10⁻³³mi² |
| 75b | 2.895766 × 10⁻³³mi² |
| 76b | 2.934377 × 10⁻³³mi² |
| 77b | 2.972987 × 10⁻³³mi² |
| 78b | 3.011597 × 10⁻³³mi² |
| 79b | 3.050207 × 10⁻³³mi² |
| 80b | 3.088817 × 10⁻³³mi² |
| 81b | 3.127428 × 10⁻³³mi² |
| 82b | 3.166038 × 10⁻³³mi² |
| 83b | 3.204648 × 10⁻³³mi² |
| 84b | 3.243258 × 10⁻³³mi² |
| 85b | 3.281868 × 10⁻³³mi² |
| 86b | 3.320479 × 10⁻³³mi² |
| 87b | 3.359089 × 10⁻³³mi² |
| 88b | 3.397699 × 10⁻³³mi² |
| 89b | 3.436309 × 10⁻³³mi² |
| 90b | 3.47492 × 10⁻³³mi² |
| 91b | 3.51353 × 10⁻³³mi² |
| 92b | 3.55214 × 10⁻³³mi² |
| 93b | 3.59075 × 10⁻³³mi² |
| 94b | 3.62936 × 10⁻³³mi² |
| 95b | 3.667971 × 10⁻³³mi² |
| 96b | 3.706581 × 10⁻³³mi² |
| 97b | 3.745191 × 10⁻³³mi² |
| 98b | 3.783801 × 10⁻³³mi² |
| 99b | 3.822412 × 10⁻³³mi² |
The barn is a unit of area and is used in particle physics with the symbol b.
It represents approximately the area of the cross-section of a uraneum nucleus, so is very small compared to most other recognised units of area.
It is also used to measure the interaction of a nucleus with an electric field gradient in nuclear quadrupole and magnetic resonance.
The square mile is a unit of area and is an imperial unit with the symbol mi².
One square mile is equal in area to a square with edges one mile in length.
The Romans established the square mile; computed through a system of feet, paces and marches. The square mile's existence still remains in some places; for example "The Square Mile" is a term often used to describe the very centre of London in the UK (which just so happens to measure 1mi²).