light-second | 1 light-second | 2 light-second | 3 light-second | 4 light-second | 5 light-second | 6 light-second | 7 light-second | 8 light-second | 9 light-second | 10 light-second | 11 light-second | 12 light-second | 13 light-second | 14 light-second | 15 light-second | 16 light-second | 17 light-second | 18 light-second | 19 light-second | 20 light-second | 21 light-second | 22 light-second | 23 light-second | 24 light-second | 25 light-second | 26 light-second | 27 light-second | 28 light-second | 29 light-second | 30 light-second | 31 light-second | 32 light-second | 33 light-second | 34 light-second | 35 light-second | 36 light-second | 37 light-second | 38 light-second | 39 light-second | 40 light-second | 41 light-second | 42 light-second | 43 light-second | 44 light-second | 45 light-second | 46 light-second | 47 light-second | 48 light-second | 49 light-second | 50 light-second | 51 light-second | 52 light-second | 53 light-second | 54 light-second | 55 light-second | 56 light-second | 57 light-second | 58 light-second | 59 light-second | 60 light-second | 61 light-second | 62 light-second | 63 light-second | 64 light-second | 65 light-second | 66 light-second | 67 light-second | 68 light-second | 69 light-second | 70 light-second | 71 light-second | 72 light-second | 73 light-second | 74 light-second | 75 light-second | 76 light-second | 77 light-second | 78 light-second | 79 light-second | 80 light-second | 81 light-second | 82 light-second | 83 light-second | 84 light-second | 85 light-second | 86 light-second | 87 light-second | 88 light-second | 89 light-second | 90 light-second | 91 light-second | 92 light-second | 93 light-second | 94 light-second | 95 light-second | 96 light-second | 97 light-second | 98 light-second | 99 light-second | 100 light-second |
fermi | 2.99792458 × 1023 fm | 5.99584916 × 1023 fm | 8.99377374 × 1023 fm | 1.199169832 × 1024 fm | 1.49896229 × 1024 fm | 1.798754748 × 1024 fm | 2.098547206 × 1024 fm | 2.398339664 × 1024 fm | 2.698132122 × 1024 fm | 2.99792458 × 1024 fm | 3.297717038 × 1024 fm | 3.597509496 × 1024 fm | 3.897301954 × 1024 fm | 4.197094412 × 1024 fm | 4.49688687 × 1024 fm | 4.796679328 × 1024 fm | 5.096471786 × 1024 fm | 5.396264244 × 1024 fm | 5.696056702 × 1024 fm | 5.99584916 × 1024 fm | 6.295641618 × 1024 fm | 6.595434076 × 1024 fm | 6.895226534 × 1024 fm | 7.195018992 × 1024 fm | 7.49481145 × 1024 fm | 7.794603908 × 1024 fm | 8.094396366 × 1024 fm | 8.394188824 × 1024 fm | 8.693981282 × 1024 fm | 8.99377374 × 1024 fm | 9.293566198 × 1024 fm | 9.593358656 × 1024 fm | 9.893151114 × 1024 fm | 1.0192943572 × 1025 fm | 1.049273603 × 1025 fm | 1.0792528488 × 1025 fm | 1.1092320946 × 1025 fm | 1.1392113404 × 1025 fm | 1.1691905862 × 1025 fm | 1.199169832 × 1025 fm | 1.2291490778 × 1025 fm | 1.2591283236 × 1025 fm | 1.2891075694 × 1025 fm | 1.3190868152 × 1025 fm | 1.349066061 × 1025 fm | 1.3790453068 × 1025 fm | 1.4090245526 × 1025 fm | 1.4390037984 × 1025 fm | 1.4689830442 × 1025 fm | 1.49896229 × 1025 fm | 1.5289415358 × 1025 fm | 1.5589207816 × 1025 fm | 1.5889000274 × 1025 fm | 1.6188792732 × 1025 fm | 1.648858519 × 1025 fm | 1.6788377648 × 1025 fm | 1.7088170106 × 1025 fm | 1.7387962564 × 1025 fm | 1.7687755022 × 1025 fm | 1.798754748 × 1025 fm | 1.8287339938 × 1025 fm | 1.8587132396 × 1025 fm | 1.8886924854 × 1025 fm | 1.9186717312 × 1025 fm | 1.948650977 × 1025 fm | 1.9786302228 × 1025 fm | 2.0086094686 × 1025 fm | 2.0385887144 × 1025 fm | 2.0685679602 × 1025 fm | 2.098547206 × 1025 fm | 2.1285264518 × 1025 fm | 2.1585056976 × 1025 fm | 2.1884849434 × 1025 fm | 2.2184641892 × 1025 fm | 2.248443435 × 1025 fm | 2.2784226808 × 1025 fm | 2.3084019266 × 1025 fm | 2.3383811724 × 1025 fm | 2.3683604182 × 1025 fm | 2.398339664 × 1025 fm | 2.4283189098 × 1025 fm | 2.4582981556 × 1025 fm | 2.4882774014 × 1025 fm | 2.5182566472 × 1025 fm | 2.548235893 × 1025 fm | 2.5782151388 × 1025 fm | 2.6081943846 × 1025 fm | 2.6381736304 × 1025 fm | 2.6681528762 × 1025 fm | 2.698132122 × 1025 fm | 2.7281113678 × 1025 fm | 2.7580906136 × 1025 fm | 2.7880698594 × 1025 fm | 2.8180491052 × 1025 fm | 2.848028351 × 1025 fm | 2.8780075968 × 1025 fm | 2.9079868426 × 1025 fm | 2.9379660884 × 1025 fm | 2.9679453342 × 1025 fm | 2.99792458 × 1025 fm |
The light-second 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 onesecond, and is equal to exactly 299792458 metres (just over 186282 miles).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
light-second | ≡ Distance light travels in one second in vacuum | ≡ 299 792 458 m | Science - Astronomy (Length) |
light-seconds | fermi | light-seconds | fermi |
---|---|---|---|
1 | ≡ 2.99792458E+23 | 4 | ≡ 1.199169832E+24 |
1.5 | ≡ 4.49688687E+23 | 4.5 | ≡ 1.349066061E+24 |
2 | ≡ 5.99584916E+23 | 5 | ≡ 1.49896229E+24 |
2.5 | ≡ 7.49481145E+23 | 5.5 | ≡ 1.648858519E+24 |
3 | ≡ 8.99377374E+23 | 6 | ≡ 1.798754748E+24 |
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 | light-seconds | fermi | light-seconds |
---|---|---|---|
1 | ≡ 3.3356409519815E-24 | 4 | ≡ 1.3342563807926E-23 |
1.5 | ≡ 5.0034614279723E-24 | 4.5 | ≡ 1.5010384283917E-23 |
2 | ≡ 6.671281903963E-24 | 5 | ≡ 1.6678204759908E-23 |
2.5 | ≡ 8.3391023799538E-24 | 5.5 | ≡ 1.8346025235898E-23 |
3 | ≡ 1.0006922855945E-23 | 6 | ≡ 2.0013845711889E-23 |
light-seconds | fermi |
---|---|
1 | ≡ 2.99792458 × 1023 |
3.3356409519815 × 10-24 | ≡ 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 …) |