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 |
x unit | 0.0099790 xu | 0.0199581 xu | 0.0299371 xu | 0.0399162 xu | 0.0498952 xu | 0.0598743 xu | 0.0698533 xu | 0.0798324 xu | 0.0898114 xu | 0.0997904 xu | 0.1097695 xu | 0.1197485 xu | 0.1297276 xu | 0.1397066 xu | 0.1496857 xu | 0.1596647 xu | 0.1696437 xu | 0.1796228 xu | 0.1896018 xu | 0.1995809 xu | 0.2095599 xu | 0.2195390 xu | 0.2295180 xu | 0.2394971 xu | 0.2494761 xu | 0.2594551 xu | 0.2694342 xu | 0.2794132 xu | 0.2893923 xu | 0.2993713 xu | 0.3093504 xu | 0.3193294 xu | 0.3293085 xu | 0.3392875 xu | 0.3492665 xu | 0.3592456 xu | 0.3692246 xu | 0.3792037 xu | 0.3891827 xu | 0.3991618 xu | 0.4091408 xu | 0.4191198 xu | 0.4290989 xu | 0.4390779 xu | 0.4490570 xu | 0.4590360 xu | 0.4690151 xu | 0.4789941 xu | 0.4889732 xu | 0.4989522 xu | 0.5089312 xu | 0.5189103 xu | 0.5288893 xu | 0.5388684 xu | 0.5488474 xu | 0.5588265 xu | 0.5688055 xu | 0.5787846 xu | 0.5887636 xu | 0.5987426 xu | 0.6087217 xu | 0.6187007 xu | 0.6286798 xu | 0.6386588 xu | 0.6486379 xu | 0.6586169 xu | 0.6685959 xu | 0.6785750 xu | 0.6885540 xu | 0.6985331 xu | 0.7085121 xu | 0.7184912 xu | 0.7284702 xu | 0.7384493 xu | 0.7484283 xu | 0.7584073 xu | 0.7683864 xu | 0.7783654 xu | 0.7883445 xu | 0.7983235 xu | 0.8083026 xu | 0.8182816 xu | 0.8282607 xu | 0.8382397 xu | 0.8482187 xu | 0.8581978 xu | 0.8681768 xu | 0.8781559 xu | 0.8881349 xu | 0.8981140 xu | 0.9080930 xu | 0.9180720 xu | 0.9280511 xu | 0.9380301 xu | 0.9480092 xu | 0.9579882 xu | 0.9679673 xu | 0.9779463 xu | 0.9879254 xu | 0.9979044 xu |
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 | x units | fermtometers | x units |
---|---|---|---|
1 | ≈ 0.0099790440075841 | 4 | ≈ 0.039916176030336 |
1.5 | ≈ 0.014968566011376 | 4.5 | ≈ 0.044905698034128 |
2 | ≈ 0.019958088015168 | 5 | ≈ 0.04989522003792 |
2.5 | ≈ 0.02494761001896 | 5.5 | ≈ 0.054884742041712 |
3 | ≈ 0.029937132022752 | 6 | ≈ 0.059874264045504 |
The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
x unit | xu | ≈ 1.0021×10−13 m | ≈ 1.0021×10−13 m | Metric system Non-SI |
x units | fermtometers | x units | fermtometers |
---|---|---|---|
1 | ≈ 100.21 | 4 | ≈ 400.84 |
1.5 | ≈ 150.315 | 4.5 | ≈ 450.945 |
2 | ≈ 200.42 | 5 | ≈ 501.05 |
2.5 | ≈ 250.525 | 5.5 | ≈ 551.155 |
3 | ≈ 300.63 | 6 | ≈ 601.26 |
fermtometers | x units |
---|---|
1 | ≈ 0.0099790 |
100.21 | ≈ 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 …) |