| picometer | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm | 12 pm | 13 pm | 14 pm | 15 pm | 16 pm | 17 pm | 18 pm | 19 pm | 20 pm | 21 pm | 22 pm | 23 pm | 24 pm | 25 pm | 26 pm | 27 pm | 28 pm | 29 pm | 30 pm | 31 pm | 32 pm | 33 pm | 34 pm | 35 pm | 36 pm | 37 pm | 38 pm | 39 pm | 40 pm | 41 pm | 42 pm | 43 pm | 44 pm | 45 pm | 46 pm | 47 pm | 48 pm | 49 pm | 50 pm | 51 pm | 52 pm | 53 pm | 54 pm | 55 pm | 56 pm | 57 pm | 58 pm | 59 pm | 60 pm | 61 pm | 62 pm | 63 pm | 64 pm | 65 pm | 66 pm | 67 pm | 68 pm | 69 pm | 70 pm | 71 pm | 72 pm | 73 pm | 74 pm | 75 pm | 76 pm | 77 pm | 78 pm | 79 pm | 80 pm | 81 pm | 82 pm | 83 pm | 84 pm | 85 pm | 86 pm | 87 pm | 88 pm | 89 pm | 90 pm | 91 pm | 92 pm | 93 pm | 94 pm | 95 pm | 96 pm | 97 pm | 98 pm | 99 pm | 100 pm |
| french; charriere | 3.0 × 10-9 F | 6.0 × 10-9 F | 9.0 × 10-9 F | 1.2 × 10-8 F | 1.5 × 10-8 F | 1.8 × 10-8 F | 2.1 × 10-8 F | 2.4 × 10-8 F | 2.7 × 10-8 F | 3.0 × 10-8 F | 3.3 × 10-8 F | 3.6 × 10-8 F | 3.9 × 10-8 F | 4.2 × 10-8 F | 4.5 × 10-8 F | 4.8 × 10-8 F | 5.1 × 10-8 F | 5.4 × 10-8 F | 5.7 × 10-8 F | 6.0 × 10-8 F | 6.3 × 10-8 F | 6.6 × 10-8 F | 6.9 × 10-8 F | 7.2 × 10-8 F | 7.5 × 10-8 F | 7.8 × 10-8 F | 8.1 × 10-8 F | 8.4 × 10-8 F | 8.7 × 10-8 F | 9.0 × 10-8 F | 9.3 × 10-8 F | 9.6 × 10-8 F | 9.9 × 10-8 F | 1.02 × 10-7 F | 1.05 × 10-7 F | 1.08 × 10-7 F | 1.11 × 10-7 F | 1.14 × 10-7 F | 1.17 × 10-7 F | 1.2 × 10-7 F | 1.23 × 10-7 F | 1.26 × 10-7 F | 1.29 × 10-7 F | 1.32 × 10-7 F | 1.35 × 10-7 F | 1.38 × 10-7 F | 1.41 × 10-7 F | 1.44 × 10-7 F | 1.47 × 10-7 F | 1.5 × 10-7 F | 1.53 × 10-7 F | 1.56 × 10-7 F | 1.59 × 10-7 F | 1.62 × 10-7 F | 1.65 × 10-7 F | 1.68 × 10-7 F | 1.71 × 10-7 F | 1.74 × 10-7 F | 1.77 × 10-7 F | 1.8 × 10-7 F | 1.83 × 10-7 F | 1.86 × 10-7 F | 1.89 × 10-7 F | 1.92 × 10-7 F | 1.95 × 10-7 F | 1.98 × 10-7 F | 2.01 × 10-7 F | 2.04 × 10-7 F | 2.07 × 10-7 F | 2.1 × 10-7 F | 2.13 × 10-7 F | 2.16 × 10-7 F | 2.19 × 10-7 F | 2.22 × 10-7 F | 2.25 × 10-7 F | 2.28 × 10-7 F | 2.31 × 10-7 F | 2.34 × 10-7 F | 2.37 × 10-7 F | 2.4 × 10-7 F | 2.43 × 10-7 F | 2.46 × 10-7 F | 2.49 × 10-7 F | 2.52 × 10-7 F | 2.55 × 10-7 F | 2.58 × 10-7 F | 2.61 × 10-7 F | 2.64 × 10-7 F | 2.67 × 10-7 F | 2.7 × 10-7 F | 2.73 × 10-7 F | 2.76 × 10-7 F | 2.79 × 10-7 F | 2.82 × 10-7 F | 2.85 × 10-7 F | 2.88 × 10-7 F | 2.91 × 10-7 F | 2.94 × 10-7 F | 2.97 × 10-7 F | 3.0 × 10-7 F |
The picometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the metric system, equal to 1×10−12 m, or one trillionth ( 1 / 1000000000000 ) of a metre, which is the SI base unit of length.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| picometer | pm | ≡ 1×10-12 m | ≡ 1×10-12 m | Metric system SI |
| picometers | french; charriere | picometers | french; charriere |
|---|---|---|---|
| 1 | = 3.0E-9 | 4 | = 1.2E-8 |
| 1.5 | = 4.5E-9 | 4.5 | = 1.35E-8 |
| 2 | = 6.0E-9 | 5 | = 1.5E-8 |
| 2.5 | = 7.5E-9 | 5.5 | = 1.65E-8 |
| 3 | = 9.0E-9 | 6 | = 1.8E-8 |
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 | picometers | french; charriere | picometers |
|---|---|---|---|
| 1 | = 333333333.33333 | 4 | = 1333333333.3333 |
| 1.5 | = 500000000 | 4.5 | = 1500000000 |
| 2 | = 666666666.66667 | 5 | = 1666666666.6667 |
| 2.5 | = 833333333.33333 | 5.5 | = 1833333333.3333 |
| 3 | = 1000000000 | 6 | = 2000000000 |
| picometers | french; charriere |
|---|---|
| 1 | = 3.0 × 10-9 |
| 333,333,333.33333 | = 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 …) |