| nanometer | 1 nm | 2 nm | 3 nm | 4 nm | 5 nm | 6 nm | 7 nm | 8 nm | 9 nm | 10 nm | 11 nm | 12 nm | 13 nm | 14 nm | 15 nm | 16 nm | 17 nm | 18 nm | 19 nm | 20 nm | 21 nm | 22 nm | 23 nm | 24 nm | 25 nm | 26 nm | 27 nm | 28 nm | 29 nm | 30 nm | 31 nm | 32 nm | 33 nm | 34 nm | 35 nm | 36 nm | 37 nm | 38 nm | 39 nm | 40 nm | 41 nm | 42 nm | 43 nm | 44 nm | 45 nm | 46 nm | 47 nm | 48 nm | 49 nm | 50 nm | 51 nm | 52 nm | 53 nm | 54 nm | 55 nm | 56 nm | 57 nm | 58 nm | 59 nm | 60 nm | 61 nm | 62 nm | 63 nm | 64 nm | 65 nm | 66 nm | 67 nm | 68 nm | 69 nm | 70 nm | 71 nm | 72 nm | 73 nm | 74 nm | 75 nm | 76 nm | 77 nm | 78 nm | 79 nm | 80 nm | 81 nm | 82 nm | 83 nm | 84 nm | 85 nm | 86 nm | 87 nm | 88 nm | 89 nm | 90 nm | 91 nm | 92 nm | 93 nm | 94 nm | 95 nm | 96 nm | 97 nm | 98 nm | 99 nm | 100 nm |
| french; charriere | 3.0 × 10-6 F | 6.0 × 10-6 F | 9.0 × 10-6 F | 1.2 × 10-5 F | 1.5 × 10-5 F | 1.8 × 10-5 F | 2.1 × 10-5 F | 2.4 × 10-5 F | 2.7 × 10-5 F | 3.0 × 10-5 F | 3.3 × 10-5 F | 3.6 × 10-5 F | 3.9 × 10-5 F | 4.2 × 10-5 F | 4.5 × 10-5 F | 4.8 × 10-5 F | 5.1 × 10-5 F | 5.4 × 10-5 F | 5.7 × 10-5 F | 6.0 × 10-5 F | 6.3 × 10-5 F | 6.6 × 10-5 F | 6.9 × 10-5 F | 7.2 × 10-5 F | 7.5 × 10-5 F | 7.8 × 10-5 F | 8.1 × 10-5 F | 8.4 × 10-5 F | 8.7 × 10-5 F | 9.0 × 10-5 F | 9.3 × 10-5 F | 9.6 × 10-5 F | 9.9 × 10-5 F | 0.000102 F | 0.000105 F | 0.000108 F | 0.000111 F | 0.000114 F | 0.000117 F | 0.00012 F | 0.000123 F | 0.000126 F | 0.000129 F | 0.000132 F | 0.000135 F | 0.000138 F | 0.000141 F | 0.000144 F | 0.000147 F | 0.00015 F | 0.000153 F | 0.000156 F | 0.000159 F | 0.000162 F | 0.000165 F | 0.000168 F | 0.000171 F | 0.000174 F | 0.000177 F | 0.00018 F | 0.000183 F | 0.000186 F | 0.000189 F | 0.000192 F | 0.000195 F | 0.000198 F | 0.000201 F | 0.000204 F | 0.000207 F | 0.00021 F | 0.000213 F | 0.000216 F | 0.000219 F | 0.000222 F | 0.000225 F | 0.000228 F | 0.000231 F | 0.000234 F | 0.000237 F | 0.00024 F | 0.000243 F | 0.000246 F | 0.000249 F | 0.000252 F | 0.000255 F | 0.000258 F | 0.000261 F | 0.000264 F | 0.000267 F | 0.00027 F | 0.000273 F | 0.000276 F | 0.000279 F | 0.000282 F | 0.000285 F | 0.000288 F | 0.000291 F | 0.000294 F | 0.000297 F | 0.0003 F |
The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth of a metre (0.000000001 m). The name combines the SI prefix nano- (from the Ancient Greek νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, metrοn, "unit of measurement"). It can be written in scientific notation as 1×10−9 m, in engineering notation as 1 E−9 m, and is simply 1/1000000000 metres.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| nanometer | nm | = 3.2808×10−9 ft | ≡ 1×10-9 m ≡ 0.000000001 m | Metric system SI |
| nanometers | french; charriere | nanometers | french; charriere |
|---|---|---|---|
| 1 | = 3.0E-6 | 4 | = 1.2E-5 |
| 1.5 | = 4.5E-6 | 4.5 | = 1.35E-5 |
| 2 | = 6.0E-6 | 5 | = 1.5E-5 |
| 2.5 | = 7.5E-6 | 5.5 | = 1.65E-5 |
| 3 | = 9.0E-6 | 6 | = 1.8E-5 |
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 | nanometers | french; charriere | nanometers |
|---|---|---|---|
| 1 | = 333333.33333333 | 4 | = 1333333.3333333 |
| 1.5 | = 500000 | 4.5 | = 1500000 |
| 2 | = 666666.66666667 | 5 | = 1666666.6666667 |
| 2.5 | = 833333.33333333 | 5.5 | = 1833333.3333333 |
| 3 | = 1000000 | 6 | = 2000000 |
| nanometers | french; charriere |
|---|---|
| 1 | = 3.0 × 10-6 |
| 333,333.3333333 | = 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 …) |