french; charriere | 1 F | 2 F | 3 F | 4 F | 5 F | 6 F | 7 F | 8 F | 9 F | 10 F | 11 F | 12 F | 13 F | 14 F | 15 F | 16 F | 17 F | 18 F | 19 F | 20 F | 21 F | 22 F | 23 F | 24 F | 25 F | 26 F | 27 F | 28 F | 29 F | 30 F | 31 F | 32 F | 33 F | 34 F | 35 F | 36 F | 37 F | 38 F | 39 F | 40 F | 41 F | 42 F | 43 F | 44 F | 45 F | 46 F | 47 F | 48 F | 49 F | 50 F | 51 F | 52 F | 53 F | 54 F | 55 F | 56 F | 57 F | 58 F | 59 F | 60 F | 61 F | 62 F | 63 F | 64 F | 65 F | 66 F | 67 F | 68 F | 69 F | 70 F | 71 F | 72 F | 73 F | 74 F | 75 F | 76 F | 77 F | 78 F | 79 F | 80 F | 81 F | 82 F | 83 F | 84 F | 85 F | 86 F | 87 F | 88 F | 89 F | 90 F | 91 F | 92 F | 93 F | 94 F | 95 F | 96 F | 97 F | 98 F | 99 F | 100 F |
fermi | 333,333,333,333.33 fm | 666,666,666,666.67 fm | 1 000 000 000 000 fm | 1,333,333,333,333.3 fm | 1,666,666,666,666.7 fm | 2 000 000 000 000 fm | 2,333,333,333,333.3 fm | 2,666,666,666,666.7 fm | 3 000 000 000 000 fm | 3,333,333,333,333.3 fm | 3,666,666,666,666.7 fm | 4 000 000 000 000 fm | 4,333,333,333,333.3 fm | 4,666,666,666,666.7 fm | 5 000 000 000 000 fm | 5,333,333,333,333.3 fm | 5,666,666,666,666.7 fm | 6 000 000 000 000 fm | 6,333,333,333,333.3 fm | 6,666,666,666,666.7 fm | 7 000 000 000 000 fm | 7,333,333,333,333.3 fm | 7,666,666,666,666.7 fm | 8 000 000 000 000 fm | 8,333,333,333,333.3 fm | 8,666,666,666,666.7 fm | 9 000 000 000 000 fm | 9,333,333,333,333.3 fm | 9,666,666,666,666.7 fm | 10 000 000 000 000 fm | 10 333 333 333 333 fm | 10 666 666 666 667 fm | 11 000 000 000 000 fm | 11 333 333 333 333 fm | 11 666 666 666 667 fm | 12 000 000 000 000 fm | 12 333 333 333 333 fm | 12 666 666 666 667 fm | 13 000 000 000 000 fm | 13 333 333 333 333 fm | 13 666 666 666 667 fm | 14 000 000 000 000 fm | 14 333 333 333 333 fm | 14 666 666 666 667 fm | 15 000 000 000 000 fm | 15 333 333 333 333 fm | 15 666 666 666 667 fm | 16 000 000 000 000 fm | 16 333 333 333 333 fm | 16 666 666 666 667 fm | 17 000 000 000 000 fm | 17 333 333 333 333 fm | 17 666 666 666 667 fm | 18 000 000 000 000 fm | 18 333 333 333 333 fm | 18 666 666 666 667 fm | 19 000 000 000 000 fm | 19 333 333 333 333 fm | 19 666 666 666 667 fm | 20 000 000 000 000 fm | 20 333 333 333 333 fm | 20 666 666 666 667 fm | 21 000 000 000 000 fm | 21 333 333 333 333 fm | 21 666 666 666 667 fm | 22 000 000 000 000 fm | 22 333 333 333 333 fm | 22 666 666 666 667 fm | 23 000 000 000 000 fm | 23 333 333 333 333 fm | 23 666 666 666 667 fm | 24 000 000 000 000 fm | 24 333 333 333 333 fm | 24 666 666 666 667 fm | 25 000 000 000 000 fm | 25 333 333 333 333 fm | 25 666 666 666 667 fm | 26 000 000 000 000 fm | 26 333 333 333 333 fm | 26 666 666 666 667 fm | 27 000 000 000 000 fm | 27 333 333 333 333 fm | 27 666 666 666 667 fm | 28 000 000 000 000 fm | 28 333 333 333 333 fm | 28 666 666 666 667 fm | 29 000 000 000 000 fm | 29 333 333 333 333 fm | 29 666 666 666 667 fm | 30 000 000 000 000 fm | 30 333 333 333 333 fm | 30 666 666 666 667 fm | 31 000 000 000 000 fm | 31 333 333 333 333 fm | 31 666 666 666 667 fm | 32 000 000 000 000 fm | 32 333 333 333 333 fm | 32 666 666 666 667 fm | 33 000 000 000 000 fm | 33 333 333 333 333 fm |
The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charrière, its inventor).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
french; charriere | F | ≡ 1⁄3 mm | = 0.3×10−3 m | Other (Length) |
french; charriere | fermi | french; charriere | fermi |
---|---|---|---|
1 | = 333333333333.33 | 4 | = 1333333333333.3 |
1.5 | = 500000000000 | 4.5 | = 1500000000000 |
2 | = 666666666666.67 | 5 | = 1666666666666.7 |
2.5 | = 833333333333.33 | 5.5 | = 1833333333333.3 |
3 | = 1000000000000 | 6 | = 2000000000000 |
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 | french; charriere | fermi | french; charriere |
---|---|---|---|
1 | = 3.0E-12 | 4 | = 1.2E-11 |
1.5 | = 4.5E-12 | 4.5 | = 1.35E-11 |
2 | = 6.0E-12 | 5 | = 1.5E-11 |
2.5 | = 7.5E-12 | 5.5 | = 1.65E-11 |
3 | = 9.0E-12 | 6 | = 1.8E-11 |
french; charriere | fermi |
---|---|
1 | = 333,333,333,333.33 |
3.0 × 10-12 | = 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 …) |