| light-year | 1 ly | 2 ly | 3 ly | 4 ly | 5 ly | 6 ly | 7 ly | 8 ly | 9 ly | 10 ly | 11 ly | 12 ly | 13 ly | 14 ly | 15 ly | 16 ly | 17 ly | 18 ly | 19 ly | 20 ly | 21 ly | 22 ly | 23 ly | 24 ly | 25 ly | 26 ly | 27 ly | 28 ly | 29 ly | 30 ly | 31 ly | 32 ly | 33 ly | 34 ly | 35 ly | 36 ly | 37 ly | 38 ly | 39 ly | 40 ly | 41 ly | 42 ly | 43 ly | 44 ly | 45 ly | 46 ly | 47 ly | 48 ly | 49 ly | 50 ly | 51 ly | 52 ly | 53 ly | 54 ly | 55 ly | 56 ly | 57 ly | 58 ly | 59 ly | 60 ly | 61 ly | 62 ly | 63 ly | 64 ly | 65 ly | 66 ly | 67 ly | 68 ly | 69 ly | 70 ly | 71 ly | 72 ly | 73 ly | 74 ly | 75 ly | 76 ly | 77 ly | 78 ly | 79 ly | 80 ly | 81 ly | 82 ly | 83 ly | 84 ly | 85 ly | 86 ly | 87 ly | 88 ly | 89 ly | 90 ly | 91 ly | 92 ly | 93 ly | 94 ly | 95 ly | 96 ly | 97 ly | 98 ly | 99 ly | 100 ly |
| french; charriere | 2.8381585214638 × 1019 F | 5.6763170429276 × 1019 F | 8.5144755643915 × 1019 F | 1.1352634085855 × 1020 F | 1.4190792607319 × 1020 F | 1.7028951128783 × 1020 F | 1.9867109650247 × 1020 F | 2.2705268171711 × 1020 F | 2.5543426693174 × 1020 F | 2.8381585214638 × 1020 F | 3.1219743736102 × 1020 F | 3.4057902257566 × 1020 F | 3.689606077903 × 1020 F | 3.9734219300493 × 1020 F | 4.2572377821957 × 1020 F | 4.5410536343421 × 1020 F | 4.8248694864885 × 1020 F | 5.1086853386349 × 1020 F | 5.3925011907813 × 1020 F | 5.6763170429276 × 1020 F | 5.960132895074 × 1020 F | 6.2439487472204 × 1020 F | 6.5277645993668 × 1020 F | 6.8115804515132 × 1020 F | 7.0953963036596 × 1020 F | 7.3792121558059 × 1020 F | 7.6630280079523 × 1020 F | 7.9468438600987 × 1020 F | 8.2306597122451 × 1020 F | 8.5144755643915 × 1020 F | 8.7982914165378 × 1020 F | 9.0821072686842 × 1020 F | 9.3659231208306 × 1020 F | 9.649738972977 × 1020 F | 9.9335548251234 × 1020 F | 1.021737067727 × 1021 F | 1.0501186529416 × 1021 F | 1.0785002381563 × 1021 F | 1.1068818233709 × 1021 F | 1.1352634085855 × 1021 F | 1.1636449938002 × 1021 F | 1.1920265790148 × 1021 F | 1.2204081642294 × 1021 F | 1.2487897494441 × 1021 F | 1.2771713346587 × 1021 F | 1.3055529198734 × 1021 F | 1.333934505088 × 1021 F | 1.3623160903026 × 1021 F | 1.3906976755173 × 1021 F | 1.4190792607319 × 1021 F | 1.4474608459465 × 1021 F | 1.4758424311612 × 1021 F | 1.5042240163758 × 1021 F | 1.5326056015905 × 1021 F | 1.5609871868051 × 1021 F | 1.5893687720197 × 1021 F | 1.6177503572344 × 1021 F | 1.646131942449 × 1021 F | 1.6745135276637 × 1021 F | 1.7028951128783 × 1021 F | 1.7312766980929 × 1021 F | 1.7596582833076 × 1021 F | 1.7880398685222 × 1021 F | 1.8164214537368 × 1021 F | 1.8448030389515 × 1021 F | 1.8731846241661 × 1021 F | 1.9015662093808 × 1021 F | 1.9299477945954 × 1021 F | 1.95832937981 × 1021 F | 1.9867109650247 × 1021 F | 2.0150925502393 × 1021 F | 2.043474135454 × 1021 F | 2.0718557206686 × 1021 F | 2.1002373058832 × 1021 F | 2.1286188910979 × 1021 F | 2.1570004763125 × 1021 F | 2.1853820615271 × 1021 F | 2.2137636467418 × 1021 F | 2.2421452319564 × 1021 F | 2.2705268171711 × 1021 F | 2.2989084023857 × 1021 F | 2.3272899876003 × 1021 F | 2.355671572815 × 1021 F | 2.3840531580296 × 1021 F | 2.4124347432442 × 1021 F | 2.4408163284589 × 1021 F | 2.4691979136735 × 1021 F | 2.4975794988882 × 1021 F | 2.5259610841028 × 1021 F | 2.5543426693174 × 1021 F | 2.5827242545321 × 1021 F | 2.6111058397467 × 1021 F | 2.6394874249614 × 1021 F | 2.667869010176 × 1021 F | 2.6962505953906 × 1021 F | 2.7246321806053 × 1021 F | 2.7530137658199 × 1021 F | 2.7813953510345 × 1021 F | 2.8097769362492 × 1021 F | 2.8381585214638 × 1021 F |
The light-year is a unit of length used to express astronomical distances. It is about 9.5 quadrillion metres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-year | ly | ≡ Distance light travels in vacuum in 365.25 days | = 9.4607304725808×1015 m | Science - Astronomy (Length) |
| light-years | french; charriere | light-years | french; charriere |
|---|---|---|---|
| 1 | = 2.8381585214638E+19 | 4 | = 1.1352634085855E+20 |
| 1.5 | = 4.2572377821957E+19 | 4.5 | = 1.2771713346587E+20 |
| 2 | = 5.6763170429276E+19 | 5 | = 1.4190792607319E+20 |
| 2.5 | = 7.0953963036596E+19 | 5.5 | = 1.5609871868051E+20 |
| 3 | = 8.5144755643915E+19 | 6 | = 1.7028951128783E+20 |
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 | light-years | french; charriere | light-years |
|---|---|---|---|
| 1 | = 3.5234113684539E-20 | 4 | = 1.4093645473816E-19 |
| 1.5 | = 5.2851170526809E-20 | 4.5 | = 1.5855351158043E-19 |
| 2 | = 7.0468227369078E-20 | 5 | = 1.761705684227E-19 |
| 2.5 | = 8.8085284211348E-20 | 5.5 | = 1.9378762526497E-19 |
| 3 | = 1.0570234105362E-19 | 6 | = 2.1140468210724E-19 |
| light-years | french; charriere |
|---|---|
| 1 | = 2.8381585214638 × 1019 |
| 3.5234113684539 × 10-20 | = 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 …) |