| speed of light | 1 c | 2 c | 3 c | 4 c | 5 c | 6 c | 7 c | 8 c | 9 c | 10 c | 11 c | 12 c | 13 c | 14 c | 15 c | 16 c | 17 c | 18 c | 19 c | 20 c | 21 c | 22 c | 23 c | 24 c | 25 c | 26 c | 27 c | 28 c | 29 c | 30 c | 31 c | 32 c | 33 c | 34 c | 35 c | 36 c | 37 c | 38 c | 39 c | 40 c | 41 c | 42 c | 43 c | 44 c | 45 c | 46 c | 47 c | 48 c | 49 c | 50 c | 51 c | 52 c | 53 c | 54 c | 55 c | 56 c | 57 c | 58 c | 59 c | 60 c | 61 c | 62 c | 63 c | 64 c | 65 c | 66 c | 67 c | 68 c | 69 c | 70 c | 71 c | 72 c | 73 c | 74 c | 75 c | 76 c | 77 c | 78 c | 79 c | 80 c | 81 c | 82 c | 83 c | 84 c | 85 c | 86 c | 87 c | 88 c | 89 c | 90 c | 91 c | 92 c | 93 c | 94 c | 95 c | 96 c | 97 c | 98 c | 99 c | 100 c |
| speed of sound (32 °F) | 905,170.4649759 s | 1,810,340.9299517 s | 2,715,511.3949275 s | 3,620,681.8599034 s | 4,525,852.3248792 s | 5,431,022.7898551 s | 6,336,193.2548309 s | 7,241,363.7198068 s | 8,146,534.1847826 s | 9,051,704.6497585 s | 9,956,875.1147343 s | 10,862,045.57971 s | 11,767,216.044686 s | 12,672,386.509662 s | 13,577,556.974638 s | 14,482,727.439614 s | 15,387,897.904589 s | 16,293,068.369565 s | 17,198,238.834541 s | 18,103,409.299517 s | 19,008,579.764493 s | 19,913,750.229469 s | 20,818,920.694444 s | 21,724,091.15942 s | 22,629,261.624396 s | 23,534,432.089372 s | 24,439,602.554348 s | 25,344,773.019324 s | 26,249,943.4843 s | 27,155,113.949275 s | 28,060,284.414251 s | 28,965,454.879227 s | 29,870,625.344203 s | 30,775,795.809179 s | 31,680,966.274155 s | 32,586,136.73913 s | 33,491,307.204106 s | 34,396,477.669082 s | 35,301,648.134058 s | 36,206,818.599034 s | 37,111,989.06401 s | 38,017,159.528986 s | 38,922,329.993961 s | 39,827,500.458937 s | 40,732,670.923913 s | 41,637,841.388889 s | 42,543,011.853865 s | 43,448,182.318841 s | 44,353,352.783816 s | 45,258,523.248792 s | 46,163,693.713768 s | 47,068,864.178744 s | 47,974,034.64372 s | 48,879,205.108696 s | 49,784,375.573671 s | 50,689,546.038647 s | 51,594,716.503623 s | 52,499,886.968599 s | 53,405,057.433575 s | 54,310,227.898551 s | 55,215,398.363527 s | 56,120,568.828502 s | 57,025,739.293478 s | 57,930,909.758454 s | 58,836,080.22343 s | 59,741,250.688406 s | 60,646,421.153382 s | 61,551,591.618357 s | 62,456,762.083333 s | 63,361,932.548309 s | 64,267,103.013285 s | 65,172,273.478261 s | 66,077,443.943237 s | 66,982,614.408213 s | 67,887,784.873188 s | 68,792,955.338164 s | 69,698,125.80314 s | 70,603,296.268116 s | 71,508,466.733092 s | 72,413,637.198068 s | 73,318,807.663043 s | 74,223,978.128019 s | 75,129,148.592995 s | 76,034,319.057971 s | 76,939,489.522947 s | 77,844,659.987923 s | 78,749,830.452899 s | 79,655,000.917874 s | 80,560,171.38285 s | 81,465,341.847826 s | 82,370,512.312802 s | 83,275,682.777778 s | 84,180,853.242754 s | 85,086,023.707729 s | 85,991,194.172705 s | 86,896,364.637681 s | 87,801,535.102657 s | 88,706,705.567633 s | 89,611,876.032609 s | 90,517,046.497585 s |
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 ≈ 905170.46497585 speed of sounds (32 °F) | 6 speed of lights ≈ 5431022.7898551 speed of sounds (32 °F) |
| 2 speed of lights ≈ 1810340.9299517 speed of sounds (32 °F) | 7 speed of lights ≈ 6336193.2548309 speed of sounds (32 °F) |
| 3 speed of lights ≈ 2715511.3949275 speed of sounds (32 °F) | 8 speed of lights ≈ 7241363.7198068 speed of sounds (32 °F) |
| 4 speed of lights ≈ 3620681.8599034 speed of sounds (32 °F) | 9 speed of lights ≈ 8146534.1847826 speed of sounds (32 °F) |
| 5 speed of lights ≈ 4525852.3248792 speed of sounds (32 °F) | 10 speed of lights ≈ 9051704.6497585 speed of sounds (32 °F) |
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 (32 °F) ≈ 1.1047642832963E-6 speed of lights | 6 speed of sounds (32 °F) ≈ 6.6285856997777E-6 speed of lights |
| 2 speed of sounds (32 °F) ≈ 2.2095285665926E-6 speed of lights | 7 speed of sounds (32 °F) ≈ 7.733349983074E-6 speed of lights |
| 3 speed of sounds (32 °F) ≈ 3.3142928498888E-6 speed of lights | 8 speed of sounds (32 °F) ≈ 8.8381142663702E-6 speed of lights |
| 4 speed of sounds (32 °F) ≈ 4.4190571331851E-6 speed of lights | 9 speed of sounds (32 °F) ≈ 9.9428785496665E-6 speed of lights |
| 5 speed of sounds (32 °F) ≈ 5.5238214164814E-6 speed of lights | 10 speed of sounds (32 °F) ≈ 1.1047642832963E-5 speed of lights |
| 1 speed of lights ≈ 905,170.4649759 speed of sounds (32 °F) |
| 1 speed of sounds (32 °F) ≈ 1.1047642832963 × 10-6 speed of lights |