fermi | 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 |
finger | 4.4994375703037 × 10-14 finger (US) | 8.9988751406074 × 10-14 finger (US) | 1.3498312710911 × 10-13 finger (US) | 1.7997750281215 × 10-13 finger (US) | 2.2497187851519 × 10-13 finger (US) | 2.6996625421822 × 10-13 finger (US) | 3.1496062992126 × 10-13 finger (US) | 3.599550056243 × 10-13 finger (US) | 4.0494938132733 × 10-13 finger (US) | 4.4994375703037 × 10-13 finger (US) | 4.9493813273341 × 10-13 finger (US) | 5.3993250843645 × 10-13 finger (US) | 5.8492688413948 × 10-13 finger (US) | 6.2992125984252 × 10-13 finger (US) | 6.7491563554556 × 10-13 finger (US) | 7.1991001124859 × 10-13 finger (US) | 7.6490438695163 × 10-13 finger (US) | 8.0989876265467 × 10-13 finger (US) | 8.5489313835771 × 10-13 finger (US) | 8.9988751406074 × 10-13 finger (US) | 9.4488188976378 × 10-13 finger (US) | 9.8987626546682 × 10-13 finger (US) | 1.0348706411699 × 10-12 finger (US) | 1.0798650168729 × 10-12 finger (US) | 1.1248593925759 × 10-12 finger (US) | 1.169853768279 × 10-12 finger (US) | 1.214848143982 × 10-12 finger (US) | 1.259842519685 × 10-12 finger (US) | 1.3048368953881 × 10-12 finger (US) | 1.3498312710911 × 10-12 finger (US) | 1.3948256467942 × 10-12 finger (US) | 1.4398200224972 × 10-12 finger (US) | 1.4848143982002 × 10-12 finger (US) | 1.5298087739033 × 10-12 finger (US) | 1.5748031496063 × 10-12 finger (US) | 1.6197975253093 × 10-12 finger (US) | 1.6647919010124 × 10-12 finger (US) | 1.7097862767154 × 10-12 finger (US) | 1.7547806524184 × 10-12 finger (US) | 1.7997750281215 × 10-12 finger (US) | 1.8447694038245 × 10-12 finger (US) | 1.8897637795276 × 10-12 finger (US) | 1.9347581552306 × 10-12 finger (US) | 1.9797525309336 × 10-12 finger (US) | 2.0247469066367 × 10-12 finger (US) | 2.0697412823397 × 10-12 finger (US) | 2.1147356580427 × 10-12 finger (US) | 2.1597300337458 × 10-12 finger (US) | 2.2047244094488 × 10-12 finger (US) | 2.2497187851519 × 10-12 finger (US) | 2.2947131608549 × 10-12 finger (US) | 2.3397075365579 × 10-12 finger (US) | 2.384701912261 × 10-12 finger (US) | 2.429696287964 × 10-12 finger (US) | 2.474690663667 × 10-12 finger (US) | 2.5196850393701 × 10-12 finger (US) | 2.5646794150731 × 10-12 finger (US) | 2.6096737907762 × 10-12 finger (US) | 2.6546681664792 × 10-12 finger (US) | 2.6996625421822 × 10-12 finger (US) | 2.7446569178853 × 10-12 finger (US) | 2.7896512935883 × 10-12 finger (US) | 2.8346456692913 × 10-12 finger (US) | 2.8796400449944 × 10-12 finger (US) | 2.9246344206974 × 10-12 finger (US) | 2.9696287964005 × 10-12 finger (US) | 3.0146231721035 × 10-12 finger (US) | 3.0596175478065 × 10-12 finger (US) | 3.1046119235096 × 10-12 finger (US) | 3.1496062992126 × 10-12 finger (US) | 3.1946006749156 × 10-12 finger (US) | 3.2395950506187 × 10-12 finger (US) | 3.2845894263217 × 10-12 finger (US) | 3.3295838020247 × 10-12 finger (US) | 3.3745781777278 × 10-12 finger (US) | 3.4195725534308 × 10-12 finger (US) | 3.4645669291339 × 10-12 finger (US) | 3.5095613048369 × 10-12 finger (US) | 3.5545556805399 × 10-12 finger (US) | 3.599550056243 × 10-12 finger (US) | 3.644544431946 × 10-12 finger (US) | 3.689538807649 × 10-12 finger (US) | 3.7345331833521 × 10-12 finger (US) | 3.7795275590551 × 10-12 finger (US) | 3.8245219347582 × 10-12 finger (US) | 3.8695163104612 × 10-12 finger (US) | 3.9145106861642 × 10-12 finger (US) | 3.9595050618673 × 10-12 finger (US) | 4.0044994375703 × 10-12 finger (US) | 4.0494938132733 × 10-12 finger (US) | 4.0944881889764 × 10-12 finger (US) | 4.1394825646794 × 10-12 finger (US) | 4.1844769403825 × 10-12 finger (US) | 4.2294713160855 × 10-12 finger (US) | 4.2744656917885 × 10-12 finger (US) | 4.3194600674916 × 10-12 finger (US) | 4.3644544431946 × 10-12 finger (US) | 4.4094488188976 × 10-12 finger (US) | 4.4544431946007 × 10-12 finger (US) | 4.4994375703037 × 10-12 finger (US) |
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 | finger | fermi | finger |
---|---|---|---|
1 | = 4.4994375703037E-14 | 4 | = 1.7997750281215E-13 |
1.5 | = 6.7491563554556E-14 | 4.5 | = 2.0247469066367E-13 |
2 | = 8.9988751406074E-14 | 5 | = 2.2497187851519E-13 |
2.5 | = 1.1248593925759E-13 | 5.5 | = 2.474690663667E-13 |
3 | = 1.3498312710911E-13 | 6 | = 2.6996625421822E-13 |
A finger (sometimes fingerbreadth or finger's breadth) is any of several units of measurement that are approximately the width of an adult human finger, including:
The digit, also known as digitus or digitus transversus (Latin), dactyl (Greek) or dactylus, or finger's breadth — 3⁄4 of an inch or 1⁄16 of a foot.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
finger | finger (US) | ≡ 7⁄8 in | = 0.022225 m | Imperial/US |
finger | fermi | finger | fermi |
---|---|---|---|
1 | = 22225000000000 | 4 | = 88900000000000 |
1.5 | = 33337500000000 | 4.5 | = 1.000125E+14 |
2 | = 44450000000000 | 5 | = 1.11125E+14 |
2.5 | = 55562500000000 | 5.5 | = 1.222375E+14 |
3 | = 66675000000000 | 6 | = 1.3335E+14 |
fermi | finger |
---|---|
1 | = 4.4994375703037 × 10-14 |
22 225 000 000 000 | = 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 …) |