| 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-minute | 5.5594015866359 × 10-26 light-minute | 1.1118803173272 × 10-25 light-minute | 1.6678204759908 × 10-25 light-minute | 2.2237606346543 × 10-25 light-minute | 2.7797007933179 × 10-25 light-minute | 3.3356409519815 × 10-25 light-minute | 3.8915811106451 × 10-25 light-minute | 4.4475212693087 × 10-25 light-minute | 5.0034614279723 × 10-25 light-minute | 5.5594015866359 × 10-25 light-minute | 6.1153417452995 × 10-25 light-minute | 6.671281903963 × 10-25 light-minute | 7.2272220626266 × 10-25 light-minute | 7.7831622212902 × 10-25 light-minute | 8.3391023799538 × 10-25 light-minute | 8.8950425386174 × 10-25 light-minute | 9.450982697281 × 10-25 light-minute | 1.0006922855945 × 10-24 light-minute | 1.0562863014608 × 10-24 light-minute | 1.1118803173272 × 10-24 light-minute | 1.1674743331935 × 10-24 light-minute | 1.2230683490599 × 10-24 light-minute | 1.2786623649262 × 10-24 light-minute | 1.3342563807926 × 10-24 light-minute | 1.389850396659 × 10-24 light-minute | 1.4454444125253 × 10-24 light-minute | 1.5010384283917 × 10-24 light-minute | 1.556632444258 × 10-24 light-minute | 1.6122264601244 × 10-24 light-minute | 1.6678204759908 × 10-24 light-minute | 1.7234144918571 × 10-24 light-minute | 1.7790085077235 × 10-24 light-minute | 1.8346025235898 × 10-24 light-minute | 1.8901965394562 × 10-24 light-minute | 1.9457905553226 × 10-24 light-minute | 2.0013845711889 × 10-24 light-minute | 2.0569785870553 × 10-24 light-minute | 2.1125726029216 × 10-24 light-minute | 2.168166618788 × 10-24 light-minute | 2.2237606346543 × 10-24 light-minute | 2.2793546505207 × 10-24 light-minute | 2.3349486663871 × 10-24 light-minute | 2.3905426822534 × 10-24 light-minute | 2.4461366981198 × 10-24 light-minute | 2.5017307139861 × 10-24 light-minute | 2.5573247298525 × 10-24 light-minute | 2.6129187457189 × 10-24 light-minute | 2.6685127615852 × 10-24 light-minute | 2.7241067774516 × 10-24 light-minute | 2.7797007933179 × 10-24 light-minute | 2.8352948091843 × 10-24 light-minute | 2.8908888250507 × 10-24 light-minute | 2.946482840917 × 10-24 light-minute | 3.0020768567834 × 10-24 light-minute | 3.0576708726497 × 10-24 light-minute | 3.1132648885161 × 10-24 light-minute | 3.1688589043824 × 10-24 light-minute | 3.2244529202488 × 10-24 light-minute | 3.2800469361152 × 10-24 light-minute | 3.3356409519815 × 10-24 light-minute | 3.3912349678479 × 10-24 light-minute | 3.4468289837142 × 10-24 light-minute | 3.5024229995806 × 10-24 light-minute | 3.558017015447 × 10-24 light-minute | 3.6136110313133 × 10-24 light-minute | 3.6692050471797 × 10-24 light-minute | 3.724799063046 × 10-24 light-minute | 3.7803930789124 × 10-24 light-minute | 3.8359870947787 × 10-24 light-minute | 3.8915811106451 × 10-24 light-minute | 3.9471751265115 × 10-24 light-minute | 4.0027691423778 × 10-24 light-minute | 4.0583631582442 × 10-24 light-minute | 4.1139571741105 × 10-24 light-minute | 4.1695511899769 × 10-24 light-minute | 4.2251452058433 × 10-24 light-minute | 4.2807392217096 × 10-24 light-minute | 4.336333237576 × 10-24 light-minute | 4.3919272534423 × 10-24 light-minute | 4.4475212693087 × 10-24 light-minute | 4.5031152851751 × 10-24 light-minute | 4.5587093010414 × 10-24 light-minute | 4.6143033169078 × 10-24 light-minute | 4.6698973327741 × 10-24 light-minute | 4.7254913486405 × 10-24 light-minute | 4.7810853645068 × 10-24 light-minute | 4.8366793803732 × 10-24 light-minute | 4.8922733962396 × 10-24 light-minute | 4.9478674121059 × 10-24 light-minute | 5.0034614279723 × 10-24 light-minute | 5.0590554438386 × 10-24 light-minute | 5.114649459705 × 10-24 light-minute | 5.1702434755714 × 10-24 light-minute | 5.2258374914377 × 10-24 light-minute | 5.2814315073041 × 10-24 light-minute | 5.3370255231704 × 10-24 light-minute | 5.3926195390368 × 10-24 light-minute | 5.4482135549032 × 10-24 light-minute | 5.5038075707695 × 10-24 light-minute | 5.5594015866359 × 10-24 light-minute |
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-minutes | fermtometers | light-minutes |
|---|---|---|---|
| 1 | ≡ 5.5594015866359E-26 | 4 | ≡ 2.2237606346543E-25 |
| 1.5 | ≡ 8.3391023799538E-26 | 4.5 | ≡ 2.5017307139861E-25 |
| 2 | ≡ 1.1118803173272E-25 | 5 | ≡ 2.7797007933179E-25 |
| 2.5 | ≡ 1.389850396659E-25 | 5.5 | ≡ 3.0576708726497E-25 |
| 3 | ≡ 1.6678204759908E-25 | 6 | ≡ 3.3356409519815E-25 |
The light-minute 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 oneminute, and is equal to exactly 1.798754748×1010 metres.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-minute | ≡ 60 light-seconds | ≡ 1.798754748×1010 m | Science - Astronomy (Length) |
| light-minutes | fermtometers | light-minutes | fermtometers |
|---|---|---|---|
| 1 | ≡ 1.798754748E+25 | 4 | ≡ 7.195018992E+25 |
| 1.5 | ≡ 2.698132122E+25 | 4.5 | ≡ 8.094396366E+25 |
| 2 | ≡ 3.597509496E+25 | 5 | ≡ 8.99377374E+25 |
| 2.5 | ≡ 4.49688687E+25 | 5.5 | ≡ 9.893151114E+25 |
| 3 | ≡ 5.396264244E+25 | 6 | ≡ 1.0792528488E+26 |
| fermtometers | light-minutes |
|---|---|
| 1 | ≡ 5.5594015866359 × 10-26 |
| 1.798754748 × 1025 | ≡ 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 …) |