| 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 |
| furlong | 4.9709695378987 × 10-18 fur | 9.9419390757973 × 10-18 fur | 1.4912908613696 × 10-17 fur | 1.9883878151595 × 10-17 fur | 2.4854847689493 × 10-17 fur | 2.9825817227392 × 10-17 fur | 3.4796786765291 × 10-17 fur | 3.9767756303189 × 10-17 fur | 4.4738725841088 × 10-17 fur | 4.9709695378987 × 10-17 fur | 5.4680664916885 × 10-17 fur | 5.9651634454784 × 10-17 fur | 6.4622603992683 × 10-17 fur | 6.9593573530581 × 10-17 fur | 7.456454306848 × 10-17 fur | 7.9535512606379 × 10-17 fur | 8.4506482144277 × 10-17 fur | 8.9477451682176 × 10-17 fur | 9.4448421220075 × 10-17 fur | 9.9419390757973 × 10-17 fur | 1.0439036029587 × 10-16 fur | 1.0936132983377 × 10-16 fur | 1.1433229937167 × 10-16 fur | 1.1930326890957 × 10-16 fur | 1.2427423844747 × 10-16 fur | 1.2924520798537 × 10-16 fur | 1.3421617752326 × 10-16 fur | 1.3918714706116 × 10-16 fur | 1.4415811659906 × 10-16 fur | 1.4912908613696 × 10-16 fur | 1.5410005567486 × 10-16 fur | 1.5907102521276 × 10-16 fur | 1.6404199475066 × 10-16 fur | 1.6901296428855 × 10-16 fur | 1.7398393382645 × 10-16 fur | 1.7895490336435 × 10-16 fur | 1.8392587290225 × 10-16 fur | 1.8889684244015 × 10-16 fur | 1.9386781197805 × 10-16 fur | 1.9883878151595 × 10-16 fur | 2.0380975105385 × 10-16 fur | 2.0878072059174 × 10-16 fur | 2.1375169012964 × 10-16 fur | 2.1872265966754 × 10-16 fur | 2.2369362920544 × 10-16 fur | 2.2866459874334 × 10-16 fur | 2.3363556828124 × 10-16 fur | 2.3860653781914 × 10-16 fur | 2.4357750735703 × 10-16 fur | 2.4854847689493 × 10-16 fur | 2.5351944643283 × 10-16 fur | 2.5849041597073 × 10-16 fur | 2.6346138550863 × 10-16 fur | 2.6843235504653 × 10-16 fur | 2.7340332458443 × 10-16 fur | 2.7837429412233 × 10-16 fur | 2.8334526366022 × 10-16 fur | 2.8831623319812 × 10-16 fur | 2.9328720273602 × 10-16 fur | 2.9825817227392 × 10-16 fur | 3.0322914181182 × 10-16 fur | 3.0820011134972 × 10-16 fur | 3.1317108088762 × 10-16 fur | 3.1814205042552 × 10-16 fur | 3.2311301996341 × 10-16 fur | 3.2808398950131 × 10-16 fur | 3.3305495903921 × 10-16 fur | 3.3802592857711 × 10-16 fur | 3.4299689811501 × 10-16 fur | 3.4796786765291 × 10-16 fur | 3.5293883719081 × 10-16 fur | 3.579098067287 × 10-16 fur | 3.628807762666 × 10-16 fur | 3.678517458045 × 10-16 fur | 3.728227153424 × 10-16 fur | 3.777936848803 × 10-16 fur | 3.827646544182 × 10-16 fur | 3.877356239561 × 10-16 fur | 3.92706593494 × 10-16 fur | 3.9767756303189 × 10-16 fur | 4.0264853256979 × 10-16 fur | 4.0761950210769 × 10-16 fur | 4.1259047164559 × 10-16 fur | 4.1756144118349 × 10-16 fur | 4.2253241072139 × 10-16 fur | 4.2750338025929 × 10-16 fur | 4.3247434979718 × 10-16 fur | 4.3744531933508 × 10-16 fur | 4.4241628887298 × 10-16 fur | 4.4738725841088 × 10-16 fur | 4.5235822794878 × 10-16 fur | 4.5732919748668 × 10-16 fur | 4.6230016702458 × 10-16 fur | 4.6727113656248 × 10-16 fur | 4.7224210610037 × 10-16 fur | 4.7721307563827 × 10-16 fur | 4.8218404517617 × 10-16 fur | 4.8715501471407 × 10-16 fur | 4.9212598425197 × 10-16 fur | 4.9709695378987 × 10-16 fur |
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 | furlong | fermtometers | furlong |
|---|---|---|---|
| 1 | = 4.9709695378987E-18 | 4 | = 1.9883878151595E-17 |
| 1.5 | = 7.456454306848E-18 | 4.5 | = 2.2369362920544E-17 |
| 2 | = 9.9419390757973E-18 | 5 | = 2.4854847689493E-17 |
| 2.5 | = 1.2427423844747E-17 | 5.5 | = 2.7340332458443E-17 |
| 3 | = 1.4912908613696E-17 | 6 | = 2.9825817227392E-17 |
A furlong is a measure of distance in imperial units and U.S. customary units equal to one-eighth of a mile, equivalent to 660 feet, 220 yards, 40 rods, or 10 chains.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| furlong | fur | ≡ 10 chains = 660 ft = 220 yd | = 201.168 m | Imperial/US |
| furlong | fermtometers | furlong | fermtometers |
|---|---|---|---|
| 1 | = 2.01168E+17 | 4 | = 8.04672E+17 |
| 1.5 | = 3.01752E+17 | 4.5 | = 9.05256E+17 |
| 2 | = 4.02336E+17 | 5 | = 1.00584E+18 |
| 2.5 | = 5.0292E+17 | 5.5 | = 1.106424E+18 |
| 3 | = 6.03504E+17 | 6 | = 1.207008E+18 |
| fermtometers | furlong |
|---|---|
| 1 | = 4.9709695378987 × 10-18 |
| 2.01168 × 1017 | = 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 …) |