chain | 1 ch | 2 ch | 3 ch | 4 ch | 5 ch | 6 ch | 7 ch | 8 ch | 9 ch | 10 ch | 11 ch | 12 ch | 13 ch | 14 ch | 15 ch | 16 ch | 17 ch | 18 ch | 19 ch | 20 ch | 21 ch | 22 ch | 23 ch | 24 ch | 25 ch | 26 ch | 27 ch | 28 ch | 29 ch | 30 ch | 31 ch | 32 ch | 33 ch | 34 ch | 35 ch | 36 ch | 37 ch | 38 ch | 39 ch | 40 ch | 41 ch | 42 ch | 43 ch | 44 ch | 45 ch | 46 ch | 47 ch | 48 ch | 49 ch | 50 ch | 51 ch | 52 ch | 53 ch | 54 ch | 55 ch | 56 ch | 57 ch | 58 ch | 59 ch | 60 ch | 61 ch | 62 ch | 63 ch | 64 ch | 65 ch | 66 ch | 67 ch | 68 ch | 69 ch | 70 ch | 71 ch | 72 ch | 73 ch | 74 ch | 75 ch | 76 ch | 77 ch | 78 ch | 79 ch | 80 ch | 81 ch | 82 ch | 83 ch | 84 ch | 85 ch | 86 ch | 87 ch | 88 ch | 89 ch | 90 ch | 91 ch | 92 ch | 93 ch | 94 ch | 95 ch | 96 ch | 97 ch | 98 ch | 99 ch | 100 ch |
fermi | 2.011684 × 1016 fm | 4.023368 × 1016 fm | 6.035052 × 1016 fm | 8.046736 × 1016 fm | 1.005842 × 1017 fm | 1.2070104 × 1017 fm | 1.4081788 × 1017 fm | 1.6093472 × 1017 fm | 1.8105156 × 1017 fm | 2.011684 × 1017 fm | 2.2128524 × 1017 fm | 2.4140208 × 1017 fm | 2.6151892 × 1017 fm | 2.8163576 × 1017 fm | 3.017526 × 1017 fm | 3.2186944 × 1017 fm | 3.4198628 × 1017 fm | 3.6210312 × 1017 fm | 3.8221996 × 1017 fm | 4.023368 × 1017 fm | 4.2245364 × 1017 fm | 4.4257048 × 1017 fm | 4.6268732 × 1017 fm | 4.8280416 × 1017 fm | 5.02921 × 1017 fm | 5.2303784 × 1017 fm | 5.4315468 × 1017 fm | 5.6327152 × 1017 fm | 5.8338836 × 1017 fm | 6.035052 × 1017 fm | 6.2362204 × 1017 fm | 6.4373888 × 1017 fm | 6.6385572 × 1017 fm | 6.8397256 × 1017 fm | 7.040894 × 1017 fm | 7.2420624 × 1017 fm | 7.4432308 × 1017 fm | 7.6443992 × 1017 fm | 7.8455676 × 1017 fm | 8.046736 × 1017 fm | 8.2479044 × 1017 fm | 8.4490728 × 1017 fm | 8.6502412 × 1017 fm | 8.8514096 × 1017 fm | 9.052578 × 1017 fm | 9.2537464 × 1017 fm | 9.4549148 × 1017 fm | 9.6560832 × 1017 fm | 9.8572516 × 1017 fm | 1.005842 × 1018 fm | 1.02595884 × 1018 fm | 1.04607568 × 1018 fm | 1.06619252 × 1018 fm | 1.08630936 × 1018 fm | 1.1064262 × 1018 fm | 1.12654304 × 1018 fm | 1.14665988 × 1018 fm | 1.16677672 × 1018 fm | 1.18689356 × 1018 fm | 1.2070104 × 1018 fm | 1.22712724 × 1018 fm | 1.24724408 × 1018 fm | 1.26736092 × 1018 fm | 1.28747776 × 1018 fm | 1.3075946 × 1018 fm | 1.32771144 × 1018 fm | 1.34782828 × 1018 fm | 1.36794512 × 1018 fm | 1.38806196 × 1018 fm | 1.4081788 × 1018 fm | 1.42829564 × 1018 fm | 1.44841248 × 1018 fm | 1.46852932 × 1018 fm | 1.48864616 × 1018 fm | 1.508763 × 1018 fm | 1.52887984 × 1018 fm | 1.54899668 × 1018 fm | 1.56911352 × 1018 fm | 1.58923036 × 1018 fm | 1.6093472 × 1018 fm | 1.62946404 × 1018 fm | 1.64958088 × 1018 fm | 1.66969772 × 1018 fm | 1.68981456 × 1018 fm | 1.7099314 × 1018 fm | 1.73004824 × 1018 fm | 1.75016508 × 1018 fm | 1.77028192 × 1018 fm | 1.79039876 × 1018 fm | 1.8105156 × 1018 fm | 1.83063244 × 1018 fm | 1.85074928 × 1018 fm | 1.87086612 × 1018 fm | 1.89098296 × 1018 fm | 1.9110998 × 1018 fm | 1.93121664 × 1018 fm | 1.95133348 × 1018 fm | 1.97145032 × 1018 fm | 1.99156716 × 1018 fm | 2.011684 × 1018 fm |
A chain is a unit of length. It measures 66 feet, or 22 yards, or 100 links, or 4 rods (20.1168 m). There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British practice.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
chain | ch | ≡ 66 ft (US) ≡ 4 rods | ≈ 20.11684 m | Imperial/US |
chains | fermi | chains | fermi |
---|---|---|---|
1 | ≈ 2.011684E+16 | 4 | ≈ 8.046736E+16 |
1.5 | ≈ 3.017526E+16 | 4.5 | ≈ 9.052578E+16 |
2 | ≈ 4.023368E+16 | 5 | ≈ 1.005842E+17 |
2.5 | ≈ 5.02921E+16 | 5.5 | ≈ 1.1064262E+17 |
3 | ≈ 6.035052E+16 | 6 | ≈ 1.2070104E+17 |
The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen"+Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one. This distance can also be called a fermi and was so named in honour of physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
fermi | fm | ≡ 1×10−15 m | ≡ 1×10−15 m | Metric system Non-SI |
fermi | chains | fermi | chains |
---|---|---|---|
1 | ≈ 4.9709596537031E-17 | 4 | ≈ 1.9883838614812E-16 |
1.5 | ≈ 7.4564394805546E-17 | 4.5 | ≈ 2.2369318441664E-16 |
2 | ≈ 9.9419193074061E-17 | 5 | ≈ 2.4854798268515E-16 |
2.5 | ≈ 1.2427399134258E-16 | 5.5 | ≈ 2.7340278095367E-16 |
3 | ≈ 1.4912878961109E-16 | 6 | ≈ 2.9825757922218E-16 |
chains | fermi |
---|---|
1 | ≈ 2.011684 × 1016 |
4.9709596537031 × 10-17 | ≈ 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 …) |