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 |
attometer | 1 000 am | 2 000 am | 3 000 am | 4 000 am | 5 000 am | 6 000 am | 7 000 am | 8 000 am | 9 000 am | 10 000 am | 11 000 am | 12 000 am | 13 000 am | 14 000 am | 15 000 am | 16 000 am | 17 000 am | 18 000 am | 19 000 am | 20 000 am | 21 000 am | 22 000 am | 23 000 am | 24 000 am | 25 000 am | 26 000 am | 27 000 am | 28 000 am | 29 000 am | 30 000 am | 31 000 am | 32 000 am | 33 000 am | 34 000 am | 35 000 am | 36 000 am | 37 000 am | 38 000 am | 39 000 am | 40 000 am | 41 000 am | 42 000 am | 43 000 am | 44 000 am | 45 000 am | 46 000 am | 47 000 am | 48 000 am | 49 000 am | 50 000 am | 51 000 am | 52 000 am | 53 000 am | 54 000 am | 55 000 am | 56 000 am | 57 000 am | 58 000 am | 59 000 am | 60 000 am | 61 000 am | 62 000 am | 63 000 am | 64 000 am | 65 000 am | 66 000 am | 67 000 am | 68 000 am | 69 000 am | 70 000 am | 71 000 am | 72 000 am | 73 000 am | 74 000 am | 75 000 am | 76 000 am | 77 000 am | 78 000 am | 79 000 am | 80 000 am | 81 000 am | 82 000 am | 83 000 am | 84 000 am | 85 000 am | 86 000 am | 87 000 am | 88 000 am | 89 000 am | 90 000 am | 91 000 am | 92 000 am | 93 000 am | 94 000 am | 95 000 am | 96 000 am | 97 000 am | 98 000 am | 99 000 am | 100 000 am |
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 | attometers | fermi | attometers |
---|---|---|---|
1 | ≡ 1000 | 4 | ≡ 4000 |
1.5 | ≡ 1500 | 4.5 | ≡ 4500 |
2 | ≡ 2000 | 5 | ≡ 5000 |
2.5 | ≡ 2500 | 5.5 | ≡ 5500 |
3 | ≡ 3000 | 6 | ≡ 6000 |
An attometer is a unit of length, a combination of the metric prefix atto (symbol a) and the SI unit of length meter (symbol m), equal to 10−18 meter or 1.0E-18 meter and its symbol is am. Plural name is attometers.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
attometer | am | ≡ 1×10-18 m | ≡ 1×10-18 m | Metric system SI |
attometers | fermi | attometers | fermi |
---|---|---|---|
1 | ≡ 0.001 | 4 | ≡ 0.004 |
1.5 | ≡ 0.0015 | 4.5 | ≡ 0.0045 |
2 | ≡ 0.002 | 5 | ≡ 0.005 |
2.5 | ≡ 0.0025 | 5.5 | ≡ 0.0055 |
3 | ≡ 0.003 | 6 | ≡ 0.006 |
fermi | attometers |
---|---|
1 | ≡ 1 000 |
0.001 | ≡ 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 …) |