| deciare | 1 da | 2 da | 3 da | 4 da | 5 da | 6 da | 7 da | 8 da | 9 da | 10 da | 11 da | 12 da | 13 da | 14 da | 15 da | 16 da | 17 da | 18 da | 19 da | 20 da | 21 da | 22 da | 23 da | 24 da | 25 da | 26 da | 27 da | 28 da | 29 da | 30 da | 31 da | 32 da | 33 da | 34 da | 35 da | 36 da | 37 da | 38 da | 39 da | 40 da | 41 da | 42 da | 43 da | 44 da | 45 da | 46 da | 47 da | 48 da | 49 da | 50 da | 51 da | 52 da | 53 da | 54 da | 55 da | 56 da | 57 da | 58 da | 59 da | 60 da | 61 da | 62 da | 63 da | 64 da | 65 da | 66 da | 67 da | 68 da | 69 da | 70 da | 71 da | 72 da | 73 da | 74 da | 75 da | 76 da | 77 da | 78 da | 79 da | 80 da | 81 da | 82 da | 83 da | 84 da | 85 da | 86 da | 87 da | 88 da | 89 da | 90 da | 91 da | 92 da | 93 da | 94 da | 95 da | 96 da | 97 da | 98 da | 99 da | 100 da |
| barn | 1.0 × 1029 b | 2.0 × 1029 b | 3.0 × 1029 b | 4.0 × 1029 b | 5.0 × 1029 b | 6.0 × 1029 b | 7.0 × 1029 b | 8.0 × 1029 b | 9.0 × 1029 b | 1.0 × 1030 b | 1.1 × 1030 b | 1.2 × 1030 b | 1.3 × 1030 b | 1.4 × 1030 b | 1.5 × 1030 b | 1.6 × 1030 b | 1.7 × 1030 b | 1.8 × 1030 b | 1.9 × 1030 b | 2.0 × 1030 b | 2.1 × 1030 b | 2.2 × 1030 b | 2.3 × 1030 b | 2.4 × 1030 b | 2.5 × 1030 b | 2.6 × 1030 b | 2.7 × 1030 b | 2.8 × 1030 b | 2.9 × 1030 b | 3.0 × 1030 b | 3.1 × 1030 b | 3.2 × 1030 b | 3.3 × 1030 b | 3.4 × 1030 b | 3.5 × 1030 b | 3.6 × 1030 b | 3.7 × 1030 b | 3.8 × 1030 b | 3.9 × 1030 b | 4.0 × 1030 b | 4.1 × 1030 b | 4.2 × 1030 b | 4.3 × 1030 b | 4.4 × 1030 b | 4.5 × 1030 b | 4.6 × 1030 b | 4.7 × 1030 b | 4.8 × 1030 b | 4.9 × 1030 b | 5.0 × 1030 b | 5.1 × 1030 b | 5.2 × 1030 b | 5.3 × 1030 b | 5.4 × 1030 b | 5.5 × 1030 b | 5.6 × 1030 b | 5.7 × 1030 b | 5.8 × 1030 b | 5.9 × 1030 b | 6.0 × 1030 b | 6.1 × 1030 b | 6.2 × 1030 b | 6.3 × 1030 b | 6.4 × 1030 b | 6.5 × 1030 b | 6.6 × 1030 b | 6.7 × 1030 b | 6.8 × 1030 b | 6.9 × 1030 b | 7.0 × 1030 b | 7.1 × 1030 b | 7.2 × 1030 b | 7.3 × 1030 b | 7.4 × 1030 b | 7.5 × 1030 b | 7.6 × 1030 b | 7.7 × 1030 b | 7.8 × 1030 b | 7.9 × 1030 b | 8.0 × 1030 b | 8.1 × 1030 b | 8.2 × 1030 b | 8.3 × 1030 b | 8.4 × 1030 b | 8.5 × 1030 b | 8.6 × 1030 b | 8.7 × 1030 b | 8.8 × 1030 b | 8.9 × 1030 b | 9.0 × 1030 b | 9.1 × 1030 b | 9.2 × 1030 b | 9.3 × 1030 b | 9.4 × 1030 b | 9.5 × 1030 b | 9.6 × 1030 b | 9.7 × 1030 b | 9.8 × 1030 b | 9.9 × 1030 b | 1.0 × 1031 b |
The deciare is ten square metres.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| deciare | da | ≡ 10 m2 | ≡ 10 m2 | Metric system SI |
| deciares | barns | deciares | barns |
|---|---|---|---|
| 1 | ≡ 1.0E+29 | 6 | ≡ 6.0E+29 |
| 2 | ≡ 2.0E+29 | 7 | ≡ 7.0E+29 |
| 3 | ≡ 3.0E+29 | 8 | ≡ 8.0E+29 |
| 4 | ≡ 4.0E+29 | 9 | ≡ 9.0E+29 |
| 5 | ≡ 5.0E+29 | 10 | ≡ 1.0E+30 |
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 | deciares | barns | deciares |
|---|---|---|---|
| 1 | ≡ 1.0E-29 | 6 | ≡ 6.0E-29 |
| 2 | ≡ 2.0E-29 | 7 | ≡ 7.0E-29 |
| 3 | ≡ 3.0E-29 | 8 | ≡ 8.0E-29 |
| 4 | ≡ 4.0E-29 | 9 | ≡ 9.0E-29 |
| 5 | ≡ 5.0E-29 | 10 | ≡ 1.0E-28 |
| deciares | barns |
|---|---|
| 1 | ≡ 1.0 × 1029 |
| 1.0 × 10-29 | ≡ 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 …) |