| 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 |
| decare | 1.0 × 10-31 Da | 2.0 × 10-31 Da | 3.0 × 10-31 Da | 4.0 × 10-31 Da | 5.0 × 10-31 Da | 6.0 × 10-31 Da | 7.0 × 10-31 Da | 8.0 × 10-31 Da | 9.0 × 10-31 Da | 1.0 × 10-30 Da | 1.1 × 10-30 Da | 1.2 × 10-30 Da | 1.3 × 10-30 Da | 1.4 × 10-30 Da | 1.5 × 10-30 Da | 1.6 × 10-30 Da | 1.7 × 10-30 Da | 1.8 × 10-30 Da | 1.9 × 10-30 Da | 2.0 × 10-30 Da | 2.1 × 10-30 Da | 2.2 × 10-30 Da | 2.3 × 10-30 Da | 2.4 × 10-30 Da | 2.5 × 10-30 Da | 2.6 × 10-30 Da | 2.7 × 10-30 Da | 2.8 × 10-30 Da | 2.9 × 10-30 Da | 3.0 × 10-30 Da | 3.1 × 10-30 Da | 3.2 × 10-30 Da | 3.3 × 10-30 Da | 3.4 × 10-30 Da | 3.5 × 10-30 Da | 3.6 × 10-30 Da | 3.7 × 10-30 Da | 3.8 × 10-30 Da | 3.9 × 10-30 Da | 4.0 × 10-30 Da | 4.1 × 10-30 Da | 4.2 × 10-30 Da | 4.3 × 10-30 Da | 4.4 × 10-30 Da | 4.5 × 10-30 Da | 4.6 × 10-30 Da | 4.7 × 10-30 Da | 4.8 × 10-30 Da | 4.9 × 10-30 Da | 5.0 × 10-30 Da | 5.1 × 10-30 Da | 5.2 × 10-30 Da | 5.3 × 10-30 Da | 5.4 × 10-30 Da | 5.5 × 10-30 Da | 5.6 × 10-30 Da | 5.7 × 10-30 Da | 5.8 × 10-30 Da | 5.9 × 10-30 Da | 6.0 × 10-30 Da | 6.1 × 10-30 Da | 6.2 × 10-30 Da | 6.3 × 10-30 Da | 6.4 × 10-30 Da | 6.5 × 10-30 Da | 6.6 × 10-30 Da | 6.7 × 10-30 Da | 6.8 × 10-30 Da | 6.9 × 10-30 Da | 7.0 × 10-30 Da | 7.1 × 10-30 Da | 7.2 × 10-30 Da | 7.3 × 10-30 Da | 7.4 × 10-30 Da | 7.5 × 10-30 Da | 7.6 × 10-30 Da | 7.7 × 10-30 Da | 7.8 × 10-30 Da | 7.9 × 10-30 Da | 8.0 × 10-30 Da | 8.1 × 10-30 Da | 8.2 × 10-30 Da | 8.3 × 10-30 Da | 8.4 × 10-30 Da | 8.5 × 10-30 Da | 8.6 × 10-30 Da | 8.7 × 10-30 Da | 8.8 × 10-30 Da | 8.9 × 10-30 Da | 9.0 × 10-30 Da | 9.1 × 10-30 Da | 9.2 × 10-30 Da | 9.3 × 10-30 Da | 9.4 × 10-30 Da | 9.5 × 10-30 Da | 9.6 × 10-30 Da | 9.7 × 10-30 Da | 9.8 × 10-30 Da | 9.9 × 10-30 Da | 1.0 × 10-29 Da |
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.
| 1 barns ≡ 1.0E-31 decares | 6 barns ≡ 6.0E-31 decares |
| 2 barns ≡ 2.0E-31 decares | 7 barns ≡ 7.0E-31 decares |
| 3 barns ≡ 3.0E-31 decares | 8 barns ≡ 8.0E-31 decares |
| 4 barns ≡ 4.0E-31 decares | 9 barns ≡ 9.0E-31 decares |
| 5 barns ≡ 5.0E-31 decares | 10 barns ≡ 1.0E-30 decares |
The decare (/ˈdɛkɑːr/ or /ˈdɛkɛər/) is derived from deca and are, and is equal to 10 ares or 1000 square metres. It is used in Norway and in the former Ottoman areas of the Middle East and the Balkans (Bulgaria) as a measure of land area. Instead of the name "decare", the names of traditional land measures are usually used, redefined as one decare:
| 1 decares ≡ 1.0E+31 barns | 6 decares ≡ 6.0E+31 barns |
| 2 decares ≡ 2.0E+31 barns | 7 decares ≡ 7.0E+31 barns |
| 3 decares ≡ 3.0E+31 barns | 8 decares ≡ 8.0E+31 barns |
| 4 decares ≡ 4.0E+31 barns | 9 decares ≡ 9.0E+31 barns |
| 5 decares ≡ 5.0E+31 barns | 10 decares ≡ 1.0E+32 barns |
| 1 barns ≡ 1.0 × 10-31 decares |
| 1 decares ≡ 1.0 × 1031 barns |