| speed of sound (68 °F) | 1 s | 2 s | 3 s | 4 s | 5 s | 6 s | 7 s | 8 s | 9 s | 10 s | 11 s | 12 s | 13 s | 14 s | 15 s | 16 s | 17 s | 18 s | 19 s | 20 s | 21 s | 22 s | 23 s | 24 s | 25 s | 26 s | 27 s | 28 s | 29 s | 30 s | 31 s | 32 s | 33 s | 34 s | 35 s | 36 s | 37 s | 38 s | 39 s | 40 s | 41 s | 42 s | 43 s | 44 s | 45 s | 46 s | 47 s | 48 s | 49 s | 50 s | 51 s | 52 s | 53 s | 54 s | 55 s | 56 s | 57 s | 58 s | 59 s | 60 s | 61 s | 62 s | 63 s | 64 s | 65 s | 66 s | 67 s | 68 s | 69 s | 70 s | 71 s | 72 s | 73 s | 74 s | 75 s | 76 s | 77 s | 78 s | 79 s | 80 s | 81 s | 82 s | 83 s | 84 s | 85 s | 86 s | 87 s | 88 s | 89 s | 90 s | 91 s | 92 s | 93 s | 94 s | 95 s | 96 s | 97 s | 98 s | 99 s | 100 s |
| speed of light | 1.1441248465297 × 10-6 c | 2.2882496930593 × 10-6 c | 3.432374539589 × 10-6 c | 4.5764993861186 × 10-6 c | 5.7206242326483 × 10-6 c | 6.864749079178 × 10-6 c | 8.0088739257076 × 10-6 c | 9.1529987722373 × 10-6 c | 1.0297123618767 × 10-5 c | 1.1441248465297 × 10-5 c | 1.2585373311826 × 10-5 c | 1.3729498158356 × 10-5 c | 1.4873623004886 × 10-5 c | 1.6017747851415 × 10-5 c | 1.7161872697945 × 10-5 c | 1.8305997544475 × 10-5 c | 1.9450122391004 × 10-5 c | 2.0594247237534 × 10-5 c | 2.1738372084064 × 10-5 c | 2.2882496930593 × 10-5 c | 2.4026621777123 × 10-5 c | 2.5170746623653 × 10-5 c | 2.6314871470182 × 10-5 c | 2.7458996316712 × 10-5 c | 2.8603121163242 × 10-5 c | 2.9747246009771 × 10-5 c | 3.0891370856301 × 10-5 c | 3.2035495702831 × 10-5 c | 3.317962054936 × 10-5 c | 3.432374539589 × 10-5 c | 3.546787024242 × 10-5 c | 3.6611995088949 × 10-5 c | 3.7756119935479 × 10-5 c | 3.8900244782008 × 10-5 c | 4.0044369628538 × 10-5 c | 4.1188494475068 × 10-5 c | 4.2332619321597 × 10-5 c | 4.3476744168127 × 10-5 c | 4.4620869014657 × 10-5 c | 4.5764993861186 × 10-5 c | 4.6909118707716 × 10-5 c | 4.8053243554246 × 10-5 c | 4.9197368400775 × 10-5 c | 5.0341493247305 × 10-5 c | 5.1485618093835 × 10-5 c | 5.2629742940364 × 10-5 c | 5.3773867786894 × 10-5 c | 5.4917992633424 × 10-5 c | 5.6062117479953 × 10-5 c | 5.7206242326483 × 10-5 c | 5.8350367173013 × 10-5 c | 5.9494492019542 × 10-5 c | 6.0638616866072 × 10-5 c | 6.1782741712602 × 10-5 c | 6.2926866559131 × 10-5 c | 6.4070991405661 × 10-5 c | 6.5215116252191 × 10-5 c | 6.635924109872 × 10-5 c | 6.750336594525 × 10-5 c | 6.864749079178 × 10-5 c | 6.9791615638309 × 10-5 c | 7.0935740484839 × 10-5 c | 7.2079865331369 × 10-5 c | 7.3223990177898 × 10-5 c | 7.4368115024428 × 10-5 c | 7.5512239870958 × 10-5 c | 7.6656364717487 × 10-5 c | 7.7800489564017 × 10-5 c | 7.8944614410547 × 10-5 c | 8.0088739257076 × 10-5 c | 8.1232864103606 × 10-5 c | 8.2376988950136 × 10-5 c | 8.3521113796665 × 10-5 c | 8.4665238643195 × 10-5 c | 8.5809363489725 × 10-5 c | 8.6953488336254 × 10-5 c | 8.8097613182784 × 10-5 c | 8.9241738029314 × 10-5 c | 9.0385862875843 × 10-5 c | 9.1529987722373 × 10-5 c | 9.2674112568903 × 10-5 c | 9.3818237415432 × 10-5 c | 9.4962362261962 × 10-5 c | 9.6106487108492 × 10-5 c | 9.7250611955021 × 10-5 c | 9.8394736801551 × 10-5 c | 9.9538861648081 × 10-5 c | 0.0001007 c | 0.0001018 c | 0.0001030 c | 0.0001041 c | 0.0001053 c | 0.0001064 c | 0.0001075 c | 0.0001087 c | 0.0001098 c | 0.0001110 c | 0.0001121 c | 0.0001133 c | 0.0001144 c |
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C (32 °F), the speed of sound is 331.2 metres per second (1,087 ft/s; 1,192 km/h; 741 mph; 644 kn). At 20 °C (68 °F), the speed of sound is 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.
| 1 speed of sounds (68 °F) ≈ 1.1441248465297E-6 speed of lights | 6 speed of sounds (68 °F) ≈ 6.864749079178E-6 speed of lights |
| 2 speed of sounds (68 °F) ≈ 2.2882496930593E-6 speed of lights | 7 speed of sounds (68 °F) ≈ 8.0088739257076E-6 speed of lights |
| 3 speed of sounds (68 °F) ≈ 3.432374539589E-6 speed of lights | 8 speed of sounds (68 °F) ≈ 9.1529987722373E-6 speed of lights |
| 4 speed of sounds (68 °F) ≈ 4.5764993861186E-6 speed of lights | 9 speed of sounds (68 °F) ≈ 1.0297123618767E-5 speed of lights |
| 5 speed of sounds (68 °F) ≈ 5.7206242326483E-6 speed of lights | 10 speed of sounds (68 °F) ≈ 1.1441248465297E-5 speed of lights |
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second (approximately 3.00×108 m/s, or 186,282 mi/s); it is exact because the unit of length, the metre, is defined from this constant and the international standard for time.
| 1 speed of lights ≈ 874030.48979592 speed of sounds (68 °F) | 6 speed of lights ≈ 5244182.9387755 speed of sounds (68 °F) |
| 2 speed of lights ≈ 1748060.9795918 speed of sounds (68 °F) | 7 speed of lights ≈ 6118213.4285714 speed of sounds (68 °F) |
| 3 speed of lights ≈ 2622091.4693878 speed of sounds (68 °F) | 8 speed of lights ≈ 6992243.9183673 speed of sounds (68 °F) |
| 4 speed of lights ≈ 3496121.9591837 speed of sounds (68 °F) | 9 speed of lights ≈ 7866274.4081633 speed of sounds (68 °F) |
| 5 speed of lights ≈ 4370152.4489796 speed of sounds (68 °F) | 10 speed of lights ≈ 8740304.8979592 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 1.1441248465297 × 10-6 speed of lights |
| 1 speed of lights ≈ 874,030.4897959 speed of sounds (68 °F) |