| fermtometer | 1 fm | 2 fm | 3 fm | 4 fm | 5 fm | 6 fm | 7 fm | 8 fm | 9 fm | 10 fm | 11 fm | 12 fm | 13 fm | 14 fm | 15 fm | 16 fm | 17 fm | 18 fm | 19 fm | 20 fm | 21 fm | 22 fm | 23 fm | 24 fm | 25 fm | 26 fm | 27 fm | 28 fm | 29 fm | 30 fm | 31 fm | 32 fm | 33 fm | 34 fm | 35 fm | 36 fm | 37 fm | 38 fm | 39 fm | 40 fm | 41 fm | 42 fm | 43 fm | 44 fm | 45 fm | 46 fm | 47 fm | 48 fm | 49 fm | 50 fm | 51 fm | 52 fm | 53 fm | 54 fm | 55 fm | 56 fm | 57 fm | 58 fm | 59 fm | 60 fm | 61 fm | 62 fm | 63 fm | 64 fm | 65 fm | 66 fm | 67 fm | 68 fm | 69 fm | 70 fm | 71 fm | 72 fm | 73 fm | 74 fm | 75 fm | 76 fm | 77 fm | 78 fm | 79 fm | 80 fm | 81 fm | 82 fm | 83 fm | 84 fm | 85 fm | 86 fm | 87 fm | 88 fm | 89 fm | 90 fm | 91 fm | 92 fm | 93 fm | 94 fm | 95 fm | 96 fm | 97 fm | 98 fm | 99 fm | 100 fm |
| link | 4.9709596537031 × 10-15 lnk | 9.9419193074061 × 10-15 lnk | 1.4912878961109 × 10-14 lnk | 1.9883838614812 × 10-14 lnk | 2.4854798268515 × 10-14 lnk | 2.9825757922218 × 10-14 lnk | 3.4796717575921 × 10-14 lnk | 3.9767677229625 × 10-14 lnk | 4.4738636883328 × 10-14 lnk | 4.9709596537031 × 10-14 lnk | 5.4680556190734 × 10-14 lnk | 5.9651515844437 × 10-14 lnk | 6.462247549814 × 10-14 lnk | 6.9593435151843 × 10-14 lnk | 7.4564394805546 × 10-14 lnk | 7.9535354459249 × 10-14 lnk | 8.4506314112952 × 10-14 lnk | 8.9477273766655 × 10-14 lnk | 9.4448233420358 × 10-14 lnk | 9.9419193074061 × 10-14 lnk | 1.0439015272776 × 10-13 lnk | 1.0936111238147 × 10-13 lnk | 1.1433207203517 × 10-13 lnk | 1.1930303168887 × 10-13 lnk | 1.2427399134258 × 10-13 lnk | 1.2924495099628 × 10-13 lnk | 1.3421591064998 × 10-13 lnk | 1.3918687030369 × 10-13 lnk | 1.4415782995739 × 10-13 lnk | 1.4912878961109 × 10-13 lnk | 1.540997492648 × 10-13 lnk | 1.590707089185 × 10-13 lnk | 1.640416685722 × 10-13 lnk | 1.690126282259 × 10-13 lnk | 1.7398358787961 × 10-13 lnk | 1.7895454753331 × 10-13 lnk | 1.8392550718701 × 10-13 lnk | 1.8889646684072 × 10-13 lnk | 1.9386742649442 × 10-13 lnk | 1.9883838614812 × 10-13 lnk | 2.0380934580183 × 10-13 lnk | 2.0878030545553 × 10-13 lnk | 2.1375126510923 × 10-13 lnk | 2.1872222476293 × 10-13 lnk | 2.2369318441664 × 10-13 lnk | 2.2866414407034 × 10-13 lnk | 2.3363510372404 × 10-13 lnk | 2.3860606337775 × 10-13 lnk | 2.4357702303145 × 10-13 lnk | 2.4854798268515 × 10-13 lnk | 2.5351894233886 × 10-13 lnk | 2.5848990199256 × 10-13 lnk | 2.6346086164626 × 10-13 lnk | 2.6843182129997 × 10-13 lnk | 2.7340278095367 × 10-13 lnk | 2.7837374060737 × 10-13 lnk | 2.8334470026107 × 10-13 lnk | 2.8831565991478 × 10-13 lnk | 2.9328661956848 × 10-13 lnk | 2.9825757922218 × 10-13 lnk | 3.0322853887589 × 10-13 lnk | 3.0819949852959 × 10-13 lnk | 3.1317045818329 × 10-13 lnk | 3.18141417837 × 10-13 lnk | 3.231123774907 × 10-13 lnk | 3.280833371444 × 10-13 lnk | 3.3305429679811 × 10-13 lnk | 3.3802525645181 × 10-13 lnk | 3.4299621610551 × 10-13 lnk | 3.4796717575921 × 10-13 lnk | 3.5293813541292 × 10-13 lnk | 3.5790909506662 × 10-13 lnk | 3.6288005472032 × 10-13 lnk | 3.6785101437403 × 10-13 lnk | 3.7282197402773 × 10-13 lnk | 3.7779293368143 × 10-13 lnk | 3.8276389333514 × 10-13 lnk | 3.8773485298884 × 10-13 lnk | 3.9270581264254 × 10-13 lnk | 3.9767677229625 × 10-13 lnk | 4.0264773194995 × 10-13 lnk | 4.0761869160365 × 10-13 lnk | 4.1258965125735 × 10-13 lnk | 4.1756061091106 × 10-13 lnk | 4.2253157056476 × 10-13 lnk | 4.2750253021846 × 10-13 lnk | 4.3247348987217 × 10-13 lnk | 4.3744444952587 × 10-13 lnk | 4.4241540917957 × 10-13 lnk | 4.4738636883328 × 10-13 lnk | 4.5235732848698 × 10-13 lnk | 4.5732828814068 × 10-13 lnk | 4.6229924779439 × 10-13 lnk | 4.6727020744809 × 10-13 lnk | 4.7224116710179 × 10-13 lnk | 4.7721212675549 × 10-13 lnk | 4.821830864092 × 10-13 lnk | 4.871540460629 × 10-13 lnk | 4.921250057166 × 10-13 lnk | 4.9709596537031 × 10-13 lnk |
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 |
|---|---|---|---|---|
| fermtometer | fm | 1000 attometres = 1 femtometre = 1 fermi = 0.001 picometre = 1×10−15 metres 1000000 femtometres = 10 ångström = 1 nanometre. | ≡ 1×10-15 m | Metric system SI |
| fermtometers | links | fermtometers | links |
|---|---|---|---|
| 1 | ≈ 4.9709596537031E-15 | 4 | ≈ 1.9883838614812E-14 |
| 1.5 | ≈ 7.4564394805546E-15 | 4.5 | ≈ 2.2369318441664E-14 |
| 2 | ≈ 9.9419193074061E-15 | 5 | ≈ 2.4854798268515E-14 |
| 2.5 | ≈ 1.2427399134258E-14 | 5.5 | ≈ 2.7340278095367E-14 |
| 3 | ≈ 1.4912878961109E-14 | 6 | ≈ 2.9825757922218E-14 |
The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. A link is exactly 66⁄100 of a foot, or exactly 7.92 inches or 20.1168 cm.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| link | lnk | ≡ 1⁄100 ch ≡ 0.66 ft (US) ≡ 7.92 in | ≈ 0.2011684 m | Imperial/US |
| links | fermtometers | links | fermtometers |
|---|---|---|---|
| 1 | ≈ 2.011684E+14 | 4 | ≈ 8.046736E+14 |
| 1.5 | ≈ 3.017526E+14 | 4.5 | ≈ 9.052578E+14 |
| 2 | ≈ 4.023368E+14 | 5 | ≈ 1.005842E+15 |
| 2.5 | ≈ 5.02921E+14 | 5.5 | ≈ 1.1064262E+15 |
| 3 | ≈ 6.035052E+14 | 6 | ≈ 1.2070104E+15 |
| fermtometers | links |
|---|---|
| 1 | ≈ 4.9709596537031 × 10-15 |
| 2.011684 × 1014 | ≈ 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 …) |