micrometer | 1 μm | 2 μm | 3 μm | 4 μm | 5 μm | 6 μm | 7 μm | 8 μm | 9 μm | 10 μm | 11 μm | 12 μm | 13 μm | 14 μm | 15 μm | 16 μm | 17 μm | 18 μm | 19 μm | 20 μm | 21 μm | 22 μm | 23 μm | 24 μm | 25 μm | 26 μm | 27 μm | 28 μm | 29 μm | 30 μm | 31 μm | 32 μm | 33 μm | 34 μm | 35 μm | 36 μm | 37 μm | 38 μm | 39 μm | 40 μm | 41 μm | 42 μm | 43 μm | 44 μm | 45 μm | 46 μm | 47 μm | 48 μm | 49 μm | 50 μm | 51 μm | 52 μm | 53 μm | 54 μm | 55 μm | 56 μm | 57 μm | 58 μm | 59 μm | 60 μm | 61 μm | 62 μm | 63 μm | 64 μm | 65 μm | 66 μm | 67 μm | 68 μm | 69 μm | 70 μm | 71 μm | 72 μm | 73 μm | 74 μm | 75 μm | 76 μm | 77 μm | 78 μm | 79 μm | 80 μm | 81 μm | 82 μm | 83 μm | 84 μm | 85 μm | 86 μm | 87 μm | 88 μm | 89 μm | 90 μm | 91 μm | 92 μm | 93 μm | 94 μm | 95 μm | 96 μm | 97 μm | 98 μm | 99 μm | 100 μm |
fermi | 1 000 000 000 fm | 2 000 000 000 fm | 3 000 000 000 fm | 4 000 000 000 fm | 5 000 000 000 fm | 6 000 000 000 fm | 7 000 000 000 fm | 8 000 000 000 fm | 9 000 000 000 fm | 10 000 000 000 fm | 11 000 000 000 fm | 12 000 000 000 fm | 13 000 000 000 fm | 14 000 000 000 fm | 15 000 000 000 fm | 16 000 000 000 fm | 17 000 000 000 fm | 18 000 000 000 fm | 19 000 000 000 fm | 20 000 000 000 fm | 21 000 000 000 fm | 22 000 000 000 fm | 23 000 000 000 fm | 24 000 000 000 fm | 25 000 000 000 fm | 26 000 000 000 fm | 27 000 000 000 fm | 28 000 000 000 fm | 29 000 000 000 fm | 30 000 000 000 fm | 31 000 000 000 fm | 32 000 000 000 fm | 33 000 000 000 fm | 34 000 000 000 fm | 35 000 000 000 fm | 36 000 000 000 fm | 37 000 000 000 fm | 38 000 000 000 fm | 39 000 000 000 fm | 40 000 000 000 fm | 41 000 000 000 fm | 42 000 000 000 fm | 43 000 000 000 fm | 44 000 000 000 fm | 45 000 000 000 fm | 46 000 000 000 fm | 47 000 000 000 fm | 48 000 000 000 fm | 49 000 000 000 fm | 50 000 000 000 fm | 51 000 000 000 fm | 52 000 000 000 fm | 53 000 000 000 fm | 54 000 000 000 fm | 55 000 000 000 fm | 56 000 000 000 fm | 57 000 000 000 fm | 58 000 000 000 fm | 59 000 000 000 fm | 60 000 000 000 fm | 61 000 000 000 fm | 62 000 000 000 fm | 63 000 000 000 fm | 64 000 000 000 fm | 65 000 000 000 fm | 66 000 000 000 fm | 67 000 000 000 fm | 68 000 000 000 fm | 69 000 000 000 fm | 70 000 000 000 fm | 71 000 000 000 fm | 72 000 000 000 fm | 73 000 000 000 fm | 74 000 000 000 fm | 75 000 000 000 fm | 76 000 000 000 fm | 77 000 000 000 fm | 78 000 000 000 fm | 79 000 000 000 fm | 80 000 000 000 fm | 81 000 000 000 fm | 82 000 000 000 fm | 83 000 000 000 fm | 84 000 000 000 fm | 85 000 000 000 fm | 86 000 000 000 fm | 87 000 000 000 fm | 88 000 000 000 fm | 89 000 000 000 fm | 90 000 000 000 fm | 91 000 000 000 fm | 92 000 000 000 fm | 93 000 000 000 fm | 94 000 000 000 fm | 95 000 000 000 fm | 96 000 000 000 fm | 97 000 000 000 fm | 98 000 000 000 fm | 99 000 000 000 fm | 100 000 000 000 fm |
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
micrometer | μm | ≡ 1×10-6 m | ≡ 1×10-6 m | Metric system SI |
micrometers | fermi | micrometers | fermi |
---|---|---|---|
1 | ≡ 1000000000 | 4 | ≡ 4000000000 |
1.5 | ≡ 1500000000 | 4.5 | ≡ 4500000000 |
2 | ≡ 2000000000 | 5 | ≡ 5000000000 |
2.5 | ≡ 2500000000 | 5.5 | ≡ 5500000000 |
3 | ≡ 3000000000 | 6 | ≡ 6000000000 |
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 | micrometers | fermi | micrometers |
---|---|---|---|
1 | ≡ 1.0E-9 | 4 | ≡ 4.0E-9 |
1.5 | ≡ 1.5E-9 | 4.5 | ≡ 4.5E-9 |
2 | ≡ 2.0E-9 | 5 | ≡ 5.0E-9 |
2.5 | ≡ 2.5E-9 | 5.5 | ≡ 5.5E-9 |
3 | ≡ 3.0E-9 | 6 | ≡ 6.0E-9 |
micrometers | fermi |
---|---|
1 | ≡ 1 000 000 000 |
1.0 × 10-9 | ≡ 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 …) |