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 |
light-day | 3.8606955462749 × 10-29 ly | 7.7213910925498 × 10-29 ly | 1.1582086638825 × 10-28 ly | 1.54427821851 × 10-28 ly | 1.9303477731375 × 10-28 ly | 2.3164173277649 × 10-28 ly | 2.7024868823924 × 10-28 ly | 3.0885564370199 × 10-28 ly | 3.4746259916474 × 10-28 ly | 3.8606955462749 × 10-28 ly | 4.2467651009024 × 10-28 ly | 4.6328346555299 × 10-28 ly | 5.0189042101574 × 10-28 ly | 5.4049737647849 × 10-28 ly | 5.7910433194124 × 10-28 ly | 6.1771128740399 × 10-28 ly | 6.5631824286673 × 10-28 ly | 6.9492519832948 × 10-28 ly | 7.3353215379223 × 10-28 ly | 7.7213910925498 × 10-28 ly | 8.1074606471773 × 10-28 ly | 8.4935302018048 × 10-28 ly | 8.8795997564323 × 10-28 ly | 9.2656693110598 × 10-28 ly | 9.6517388656873 × 10-28 ly | 1.0037808420315 × 10-27 ly | 1.0423877974942 × 10-27 ly | 1.080994752957 × 10-27 ly | 1.1196017084197 × 10-27 ly | 1.1582086638825 × 10-27 ly | 1.1968156193452 × 10-27 ly | 1.235422574808 × 10-27 ly | 1.2740295302707 × 10-27 ly | 1.3126364857335 × 10-27 ly | 1.3512434411962 × 10-27 ly | 1.389850396659 × 10-27 ly | 1.4284573521217 × 10-27 ly | 1.4670643075845 × 10-27 ly | 1.5056712630472 × 10-27 ly | 1.54427821851 × 10-27 ly | 1.5828851739727 × 10-27 ly | 1.6214921294355 × 10-27 ly | 1.6600990848982 × 10-27 ly | 1.698706040361 × 10-27 ly | 1.7373129958237 × 10-27 ly | 1.7759199512865 × 10-27 ly | 1.8145269067492 × 10-27 ly | 1.853133862212 × 10-27 ly | 1.8917408176747 × 10-27 ly | 1.9303477731375 × 10-27 ly | 1.9689547286002 × 10-27 ly | 2.007561684063 × 10-27 ly | 2.0461686395257 × 10-27 ly | 2.0847755949885 × 10-27 ly | 2.1233825504512 × 10-27 ly | 2.1619895059139 × 10-27 ly | 2.2005964613767 × 10-27 ly | 2.2392034168394 × 10-27 ly | 2.2778103723022 × 10-27 ly | 2.3164173277649 × 10-27 ly | 2.3550242832277 × 10-27 ly | 2.3936312386904 × 10-27 ly | 2.4322381941532 × 10-27 ly | 2.4708451496159 × 10-27 ly | 2.5094521050787 × 10-27 ly | 2.5480590605414 × 10-27 ly | 2.5866660160042 × 10-27 ly | 2.6252729714669 × 10-27 ly | 2.6638799269297 × 10-27 ly | 2.7024868823924 × 10-27 ly | 2.7410938378552 × 10-27 ly | 2.7797007933179 × 10-27 ly | 2.8183077487807 × 10-27 ly | 2.8569147042434 × 10-27 ly | 2.8955216597062 × 10-27 ly | 2.9341286151689 × 10-27 ly | 2.9727355706317 × 10-27 ly | 3.0113425260944 × 10-27 ly | 3.0499494815572 × 10-27 ly | 3.0885564370199 × 10-27 ly | 3.1271633924827 × 10-27 ly | 3.1657703479454 × 10-27 ly | 3.2043773034082 × 10-27 ly | 3.2429842588709 × 10-27 ly | 3.2815912143337 × 10-27 ly | 3.3201981697964 × 10-27 ly | 3.3588051252592 × 10-27 ly | 3.3974120807219 × 10-27 ly | 3.4360190361847 × 10-27 ly | 3.4746259916474 × 10-27 ly | 3.5132329471102 × 10-27 ly | 3.5518399025729 × 10-27 ly | 3.5904468580357 × 10-27 ly | 3.6290538134984 × 10-27 ly | 3.6676607689612 × 10-27 ly | 3.7062677244239 × 10-27 ly | 3.7448746798867 × 10-27 ly | 3.7834816353494 × 10-27 ly | 3.8220885908122 × 10-27 ly | 3.8606955462749 × 10-27 ly |
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 | light-days | fermtometers | light-days |
---|---|---|---|
1 | ≡ 3.8606955462749E-29 | 4 | ≡ 1.54427821851E-28 |
1.5 | ≡ 5.7910433194124E-29 | 4.5 | ≡ 1.7373129958237E-28 |
2 | ≡ 7.7213910925498E-29 | 5 | ≡ 1.9303477731375E-28 |
2.5 | ≡ 9.6517388656873E-29 | 5.5 | ≡ 2.1233825504512E-28 |
3 | ≡ 1.1582086638825E-28 | 6 | ≡ 2.3164173277649E-28 |
The light-day is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in oneday, and is equal to exactly 2.59020683712×1013 metres.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
light-day | ly | ≡ 24 light-hours | ≡ 2.59020683712×1013 m | Science - Astronomy (Length) |
light-days | fermtometers | light-days | fermtometers |
---|---|---|---|
1 | ≡ 2.59020683712E+28 | 4 | ≡ 1.036082734848E+29 |
1.5 | ≡ 3.88531025568E+28 | 4.5 | ≡ 1.165593076704E+29 |
2 | ≡ 5.18041367424E+28 | 5 | ≡ 1.29510341856E+29 |
2.5 | ≡ 6.4755170928E+28 | 5.5 | ≡ 1.424613760416E+29 |
3 | ≡ 7.77062051136E+28 | 6 | ≡ 1.554124102272E+29 |
fermtometers | light-days |
---|---|
1 | ≡ 3.8606955462749 × 10-29 |
2.59020683712 × 1028 | ≡ 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 …) |