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 |
hectare | 1.0 × 10-32 ha | 2.0 × 10-32 ha | 3.0 × 10-32 ha | 4.0 × 10-32 ha | 5.0 × 10-32 ha | 6.0 × 10-32 ha | 7.0 × 10-32 ha | 8.0 × 10-32 ha | 9.0 × 10-32 ha | 1.0 × 10-31 ha | 1.1 × 10-31 ha | 1.2 × 10-31 ha | 1.3 × 10-31 ha | 1.4 × 10-31 ha | 1.5 × 10-31 ha | 1.6 × 10-31 ha | 1.7 × 10-31 ha | 1.8 × 10-31 ha | 1.9 × 10-31 ha | 2.0 × 10-31 ha | 2.1 × 10-31 ha | 2.2 × 10-31 ha | 2.3 × 10-31 ha | 2.4 × 10-31 ha | 2.5 × 10-31 ha | 2.6 × 10-31 ha | 2.7 × 10-31 ha | 2.8 × 10-31 ha | 2.9 × 10-31 ha | 3.0 × 10-31 ha | 3.1 × 10-31 ha | 3.2 × 10-31 ha | 3.3 × 10-31 ha | 3.4 × 10-31 ha | 3.5 × 10-31 ha | 3.6 × 10-31 ha | 3.7 × 10-31 ha | 3.8 × 10-31 ha | 3.9 × 10-31 ha | 4.0 × 10-31 ha | 4.1 × 10-31 ha | 4.2 × 10-31 ha | 4.3 × 10-31 ha | 4.4 × 10-31 ha | 4.5 × 10-31 ha | 4.6 × 10-31 ha | 4.7 × 10-31 ha | 4.8 × 10-31 ha | 4.9 × 10-31 ha | 5.0 × 10-31 ha | 5.1 × 10-31 ha | 5.2 × 10-31 ha | 5.3 × 10-31 ha | 5.4 × 10-31 ha | 5.5 × 10-31 ha | 5.6 × 10-31 ha | 5.7 × 10-31 ha | 5.8 × 10-31 ha | 5.9 × 10-31 ha | 6.0 × 10-31 ha | 6.1 × 10-31 ha | 6.2 × 10-31 ha | 6.3 × 10-31 ha | 6.4 × 10-31 ha | 6.5 × 10-31 ha | 6.6 × 10-31 ha | 6.7 × 10-31 ha | 6.8 × 10-31 ha | 6.9 × 10-31 ha | 7.0 × 10-31 ha | 7.1 × 10-31 ha | 7.2 × 10-31 ha | 7.3 × 10-31 ha | 7.4 × 10-31 ha | 7.5 × 10-31 ha | 7.6 × 10-31 ha | 7.7 × 10-31 ha | 7.8 × 10-31 ha | 7.9 × 10-31 ha | 8.0 × 10-31 ha | 8.1 × 10-31 ha | 8.2 × 10-31 ha | 8.3 × 10-31 ha | 8.4 × 10-31 ha | 8.5 × 10-31 ha | 8.6 × 10-31 ha | 8.7 × 10-31 ha | 8.8 × 10-31 ha | 8.9 × 10-31 ha | 9.0 × 10-31 ha | 9.1 × 10-31 ha | 9.2 × 10-31 ha | 9.3 × 10-31 ha | 9.4 × 10-31 ha | 9.5 × 10-31 ha | 9.6 × 10-31 ha | 9.7 × 10-31 ha | 9.8 × 10-31 ha | 9.9 × 10-31 ha | 1.0 × 10-30 ha |
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 | hectares | barns | hectares |
---|---|---|---|
1 | ≡ 1.0E-32 | 6 | ≡ 6.0E-32 |
2 | ≡ 2.0E-32 | 7 | ≡ 7.0E-32 |
3 | ≡ 3.0E-32 | 8 | ≡ 8.0E-32 |
4 | ≡ 4.0E-32 | 9 | ≡ 9.0E-32 |
5 | ≡ 5.0E-32 | 10 | ≡ 1.0E-31 |
The hectare (/ˈhɛktɛər/ or /ˈhɛktɑːr/), although not a unit of SI, is the only named unit of area that is accepted for use within the SI. In practice the hectare is fully derived from the SI, being equivalent to a square hectometre. It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and management, including law (land deeds), agriculture, forestry, and town planning throughout the European Union. The United Kingdom, United States, Burma, and to some extent Canada instead use the acre.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
hectare | ha | ≡ 10000 m2 | ≡ 10000 m2 | Metric system SI |
hectares | barns | hectares | barns |
---|---|---|---|
1 | ≡ 1.0E+32 | 6 | ≡ 6.0E+32 |
2 | ≡ 2.0E+32 | 7 | ≡ 7.0E+32 |
3 | ≡ 3.0E+32 | 8 | ≡ 8.0E+32 |
4 | ≡ 4.0E+32 | 9 | ≡ 9.0E+32 |
5 | ≡ 5.0E+32 | 10 | ≡ 1.0E+33 |
barns | hectares |
---|---|
1 | ≡ 1.0 × 10-32 |
1.0 × 1032 | ≡ 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 …) |