| light-second | 1 light-second | 2 light-second | 3 light-second | 4 light-second | 5 light-second | 6 light-second | 7 light-second | 8 light-second | 9 light-second | 10 light-second | 11 light-second | 12 light-second | 13 light-second | 14 light-second | 15 light-second | 16 light-second | 17 light-second | 18 light-second | 19 light-second | 20 light-second | 21 light-second | 22 light-second | 23 light-second | 24 light-second | 25 light-second | 26 light-second | 27 light-second | 28 light-second | 29 light-second | 30 light-second | 31 light-second | 32 light-second | 33 light-second | 34 light-second | 35 light-second | 36 light-second | 37 light-second | 38 light-second | 39 light-second | 40 light-second | 41 light-second | 42 light-second | 43 light-second | 44 light-second | 45 light-second | 46 light-second | 47 light-second | 48 light-second | 49 light-second | 50 light-second | 51 light-second | 52 light-second | 53 light-second | 54 light-second | 55 light-second | 56 light-second | 57 light-second | 58 light-second | 59 light-second | 60 light-second | 61 light-second | 62 light-second | 63 light-second | 64 light-second | 65 light-second | 66 light-second | 67 light-second | 68 light-second | 69 light-second | 70 light-second | 71 light-second | 72 light-second | 73 light-second | 74 light-second | 75 light-second | 76 light-second | 77 light-second | 78 light-second | 79 light-second | 80 light-second | 81 light-second | 82 light-second | 83 light-second | 84 light-second | 85 light-second | 86 light-second | 87 light-second | 88 light-second | 89 light-second | 90 light-second | 91 light-second | 92 light-second | 93 light-second | 94 light-second | 95 light-second | 96 light-second | 97 light-second | 98 light-second | 99 light-second | 100 light-second |
| french; charriere | 899 377 374 000 F | 1 798 754 748 000 F | 2 698 132 122 000 F | 3 597 509 496 000 F | 4 496 886 870 000 F | 5 396 264 244 000 F | 6 295 641 618 000 F | 7 195 018 992 000 F | 8 094 396 366 000 F | 8 993 773 740 000 F | 9 893 151 114 000 F | 10 792 528 488 000 F | 11 691 905 862 000 F | 12 591 283 236 000 F | 13 490 660 610 000 F | 14 390 037 984 000 F | 15 289 415 358 000 F | 16 188 792 732 000 F | 17 088 170 106 000 F | 17 987 547 480 000 F | 18 886 924 854 000 F | 19 786 302 228 000 F | 20 685 679 602 000 F | 21 585 056 976 000 F | 22 484 434 350 000 F | 23 383 811 724 000 F | 24 283 189 098 000 F | 25 182 566 472 000 F | 26 081 943 846 000 F | 26 981 321 220 000 F | 27 880 698 594 000 F | 28 780 075 968 000 F | 29 679 453 342 000 F | 30 578 830 716 000 F | 31 478 208 090 000 F | 32 377 585 464 000 F | 33 276 962 838 000 F | 34 176 340 212 000 F | 35 075 717 586 000 F | 35 975 094 960 000 F | 36 874 472 334 000 F | 37 773 849 708 000 F | 38 673 227 082 000 F | 39 572 604 456 000 F | 40 471 981 830 000 F | 41 371 359 204 000 F | 42 270 736 578 000 F | 43 170 113 952 000 F | 44 069 491 326 000 F | 44 968 868 700 000 F | 45 868 246 074 000 F | 46 767 623 448 000 F | 47 667 000 822 000 F | 48 566 378 196 000 F | 49 465 755 570 000 F | 50 365 132 944 000 F | 51 264 510 318 000 F | 52 163 887 692 000 F | 53 063 265 066 000 F | 53 962 642 440 000 F | 54 862 019 814 000 F | 55 761 397 188 000 F | 56 660 774 562 000 F | 57 560 151 936 000 F | 58 459 529 310 000 F | 59 358 906 684 000 F | 60 258 284 058 000 F | 61 157 661 432 000 F | 62 057 038 806 000 F | 62 956 416 180 000 F | 63 855 793 554 000 F | 64 755 170 928 000 F | 65 654 548 302 000 F | 66 553 925 676 000 F | 67 453 303 050 000 F | 68 352 680 424 000 F | 69 252 057 798 000 F | 70 151 435 172 000 F | 71 050 812 546 000 F | 71 950 189 920 000 F | 72 849 567 294 000 F | 73 748 944 668 000 F | 74 648 322 042 000 F | 75 547 699 416 000 F | 76 447 076 790 000 F | 77 346 454 164 000 F | 78 245 831 538 000 F | 79 145 208 912 000 F | 80 044 586 286 000 F | 80 943 963 660 000 F | 81 843 341 034 000 F | 82 742 718 408 000 F | 83 642 095 782 000 F | 84 541 473 156 000 F | 85 440 850 530 000 F | 86 340 227 904 000 F | 87 239 605 278 000 F | 88 138 982 652 000 F | 89 038 360 026 000 F | 89 937 737 400 000 F |
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in onesecond, and is equal to exactly 299792458 metres (just over 186282 miles).
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| light-second | ≡ Distance light travels in one second in vacuum | ≡ 299 792 458 m | Science - Astronomy (Length) |
| light-seconds | french; charriere | light-seconds | french; charriere |
|---|---|---|---|
| 1 | = 899377374000 | 4 | = 3597509496000 |
| 1.5 | = 1349066061000 | 4.5 | = 4047198183000 |
| 2 | = 1798754748000 | 5 | = 4496886870000 |
| 2.5 | = 2248443435000 | 5.5 | = 4946575557000 |
| 3 | = 2698132122000 | 6 | = 5396264244000 |
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-seconds | french; charriere | light-seconds |
|---|---|---|---|
| 1 | = 1.1118803173272E-12 | 4 | = 4.4475212693087E-12 |
| 1.5 | = 1.6678204759908E-12 | 4.5 | = 5.0034614279723E-12 |
| 2 | = 2.2237606346543E-12 | 5 | = 5.5594015866359E-12 |
| 2.5 | = 2.7797007933179E-12 | 5.5 | = 6.1153417452995E-12 |
| 3 | = 3.3356409519815E-12 | 6 | = 6.671281903963E-12 |
| light-seconds | french; charriere |
|---|---|
| 1 | = 899 377 374 000 |
| 1.1118803173272 × 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 …) |