x unit | 1 xu | 2 xu | 3 xu | 4 xu | 5 xu | 6 xu | 7 xu | 8 xu | 9 xu | 10 xu | 11 xu | 12 xu | 13 xu | 14 xu | 15 xu | 16 xu | 17 xu | 18 xu | 19 xu | 20 xu | 21 xu | 22 xu | 23 xu | 24 xu | 25 xu | 26 xu | 27 xu | 28 xu | 29 xu | 30 xu | 31 xu | 32 xu | 33 xu | 34 xu | 35 xu | 36 xu | 37 xu | 38 xu | 39 xu | 40 xu | 41 xu | 42 xu | 43 xu | 44 xu | 45 xu | 46 xu | 47 xu | 48 xu | 49 xu | 50 xu | 51 xu | 52 xu | 53 xu | 54 xu | 55 xu | 56 xu | 57 xu | 58 xu | 59 xu | 60 xu | 61 xu | 62 xu | 63 xu | 64 xu | 65 xu | 66 xu | 67 xu | 68 xu | 69 xu | 70 xu | 71 xu | 72 xu | 73 xu | 74 xu | 75 xu | 76 xu | 77 xu | 78 xu | 79 xu | 80 xu | 81 xu | 82 xu | 83 xu | 84 xu | 85 xu | 86 xu | 87 xu | 88 xu | 89 xu | 90 xu | 91 xu | 92 xu | 93 xu | 94 xu | 95 xu | 96 xu | 97 xu | 98 xu | 99 xu | 100 xu |
fermtometer | 100.21 fm | 200.42 fm | 300.63 fm | 400.84 fm | 501.05 fm | 601.26 fm | 701.47 fm | 801.68 fm | 901.89 fm | 1,002.1 fm | 1,102.31 fm | 1,202.52 fm | 1,302.73 fm | 1,402.94 fm | 1,503.15 fm | 1,603.36 fm | 1,703.57 fm | 1,803.78 fm | 1,903.99 fm | 2,004.2 fm | 2,104.41 fm | 2,204.62 fm | 2,304.83 fm | 2,405.04 fm | 2,505.25 fm | 2,605.46 fm | 2,705.67 fm | 2,805.88 fm | 2,906.09 fm | 3,006.3 fm | 3,106.51 fm | 3,206.72 fm | 3,306.93 fm | 3,407.14 fm | 3,507.35 fm | 3,607.56 fm | 3,707.77 fm | 3,807.98 fm | 3,908.19 fm | 4,008.4 fm | 4,108.61 fm | 4,208.82 fm | 4,309.03 fm | 4,409.24 fm | 4,509.45 fm | 4,609.66 fm | 4,709.87 fm | 4,810.08 fm | 4,910.29 fm | 5,010.5 fm | 5,110.71 fm | 5,210.92 fm | 5,311.13 fm | 5,411.34 fm | 5,511.55 fm | 5,611.76 fm | 5,711.97 fm | 5,812.18 fm | 5,912.39 fm | 6,012.6 fm | 6,112.81 fm | 6,213.02 fm | 6,313.23 fm | 6,413.44 fm | 6,513.65 fm | 6,613.86 fm | 6,714.07 fm | 6,814.28 fm | 6,914.49 fm | 7,014.7 fm | 7,114.91 fm | 7,215.12 fm | 7,315.33 fm | 7,415.54 fm | 7,515.75 fm | 7,615.96 fm | 7,716.17 fm | 7,816.38 fm | 7,916.59 fm | 8,016.8 fm | 8,117.01 fm | 8,217.22 fm | 8,317.43 fm | 8,417.64 fm | 8,517.85 fm | 8,618.06 fm | 8,718.27 fm | 8,818.48 fm | 8,918.69 fm | 9,018.9 fm | 9,119.11 fm | 9,219.32 fm | 9,319.53 fm | 9,419.74 fm | 9,519.95 fm | 9,620.16 fm | 9,720.37 fm | 9,820.58 fm | 9,920.79 fm | 10 021 fm |
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 |
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 |
x units | fermtometers |
---|---|
1 | ≈ 100.21 |
0.0099790 | ≈ 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 …) |