| 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 |
| line | 4.7244094488189 × 10-13 ln | 9.4488188976378 × 10-13 ln | 1.4173228346457 × 10-12 ln | 1.8897637795276 × 10-12 ln | 2.3622047244094 × 10-12 ln | 2.8346456692913 × 10-12 ln | 3.3070866141732 × 10-12 ln | 3.7795275590551 × 10-12 ln | 4.251968503937 × 10-12 ln | 4.7244094488189 × 10-12 ln | 5.1968503937008 × 10-12 ln | 5.6692913385827 × 10-12 ln | 6.1417322834646 × 10-12 ln | 6.6141732283465 × 10-12 ln | 7.0866141732283 × 10-12 ln | 7.5590551181102 × 10-12 ln | 8.0314960629921 × 10-12 ln | 8.503937007874 × 10-12 ln | 8.9763779527559 × 10-12 ln | 9.4488188976378 × 10-12 ln | 9.9212598425197 × 10-12 ln | 1.0393700787402 × 10-11 ln | 1.0866141732283 × 10-11 ln | 1.1338582677165 × 10-11 ln | 1.1811023622047 × 10-11 ln | 1.2283464566929 × 10-11 ln | 1.2755905511811 × 10-11 ln | 1.3228346456693 × 10-11 ln | 1.3700787401575 × 10-11 ln | 1.4173228346457 × 10-11 ln | 1.4645669291339 × 10-11 ln | 1.511811023622 × 10-11 ln | 1.5590551181102 × 10-11 ln | 1.6062992125984 × 10-11 ln | 1.6535433070866 × 10-11 ln | 1.7007874015748 × 10-11 ln | 1.748031496063 × 10-11 ln | 1.7952755905512 × 10-11 ln | 1.8425196850394 × 10-11 ln | 1.8897637795276 × 10-11 ln | 1.9370078740157 × 10-11 ln | 1.9842519685039 × 10-11 ln | 2.0314960629921 × 10-11 ln | 2.0787401574803 × 10-11 ln | 2.1259842519685 × 10-11 ln | 2.1732283464567 × 10-11 ln | 2.2204724409449 × 10-11 ln | 2.2677165354331 × 10-11 ln | 2.3149606299213 × 10-11 ln | 2.3622047244094 × 10-11 ln | 2.4094488188976 × 10-11 ln | 2.4566929133858 × 10-11 ln | 2.503937007874 × 10-11 ln | 2.5511811023622 × 10-11 ln | 2.5984251968504 × 10-11 ln | 2.6456692913386 × 10-11 ln | 2.6929133858268 × 10-11 ln | 2.740157480315 × 10-11 ln | 2.7874015748032 × 10-11 ln | 2.8346456692913 × 10-11 ln | 2.8818897637795 × 10-11 ln | 2.9291338582677 × 10-11 ln | 2.9763779527559 × 10-11 ln | 3.0236220472441 × 10-11 ln | 3.0708661417323 × 10-11 ln | 3.1181102362205 × 10-11 ln | 3.1653543307087 × 10-11 ln | 3.2125984251969 × 10-11 ln | 3.259842519685 × 10-11 ln | 3.3070866141732 × 10-11 ln | 3.3543307086614 × 10-11 ln | 3.4015748031496 × 10-11 ln | 3.4488188976378 × 10-11 ln | 3.496062992126 × 10-11 ln | 3.5433070866142 × 10-11 ln | 3.5905511811024 × 10-11 ln | 3.6377952755906 × 10-11 ln | 3.6850393700787 × 10-11 ln | 3.7322834645669 × 10-11 ln | 3.7795275590551 × 10-11 ln | 3.8267716535433 × 10-11 ln | 3.8740157480315 × 10-11 ln | 3.9212598425197 × 10-11 ln | 3.9685039370079 × 10-11 ln | 4.0157480314961 × 10-11 ln | 4.0629921259843 × 10-11 ln | 4.1102362204724 × 10-11 ln | 4.1574803149606 × 10-11 ln | 4.2047244094488 × 10-11 ln | 4.251968503937 × 10-11 ln | 4.2992125984252 × 10-11 ln | 4.3464566929134 × 10-11 ln | 4.3937007874016 × 10-11 ln | 4.4409448818898 × 10-11 ln | 4.488188976378 × 10-11 ln | 4.5354330708661 × 10-11 ln | 4.5826771653543 × 10-11 ln | 4.6299212598425 × 10-11 ln | 4.6771653543307 × 10-11 ln | 4.7244094488189 × 10-11 ln |
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 | lines | fermtometers | lines |
|---|---|---|---|
| 1 | = 4.7244094488189E-13 | 4 | = 1.8897637795276E-12 |
| 1.5 | = 7.0866141732283E-13 | 4.5 | = 2.1259842519685E-12 |
| 2 | = 9.4488188976378E-13 | 5 | = 2.3622047244094E-12 |
| 2.5 | = 1.1811023622047E-12 | 5.5 | = 2.5984251968504E-12 |
| 3 | = 1.4173228346457E-12 | 6 | = 2.8346456692913E-12 |
The line (abbreviated L or l) was a small English unit of length, variously reckoned as 1⁄10, 1⁄12, 1⁄16, or 1⁄40 of an inch. It was not included among the units authorized as the British Imperial system in 1824.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| line | ln | ≡ 1⁄12 in | = 0.002116 m | Imperial/US |
| lines | fermtometers | lines | fermtometers |
|---|---|---|---|
| 1 | = 2116666666666.7 | 4 | = 8466666666666.7 |
| 1.5 | = 3175000000000 | 4.5 | = 9525000000000 |
| 2 | = 4233333333333.3 | 5 | = 10583333333333 |
| 2.5 | = 5291666666666.7 | 5.5 | = 11641666666667 |
| 3 | = 6350000000000 | 6 | = 12700000000000 |
| fermtometers | lines |
|---|---|
| 1 | = 4.7244094488189 × 10-13 |
| 2,116,666,666,666.7 | = 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 …) |