| 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 (68 °F) | 874,030.4897959 s | 1,748,060.9795918 s | 2,622,091.4693878 s | 3,496,121.9591837 s | 4,370,152.4489796 s | 5,244,182.9387755 s | 6,118,213.4285714 s | 6,992,243.9183673 s | 7,866,274.4081633 s | 8,740,304.8979592 s | 9,614,335.3877551 s | 10,488,365.877551 s | 11,362,396.367347 s | 12,236,426.857143 s | 13,110,457.346939 s | 13,984,487.836735 s | 14,858,518.326531 s | 15,732,548.816327 s | 16,606,579.306122 s | 17,480,609.795918 s | 18,354,640.285714 s | 19,228,670.77551 s | 20,102,701.265306 s | 20,976,731.755102 s | 21,850,762.244898 s | 22,724,792.734694 s | 23,598,823.22449 s | 24,472,853.714286 s | 25,346,884.204082 s | 26,220,914.693878 s | 27,094,945.183673 s | 27,968,975.673469 s | 28,843,006.163265 s | 29,717,036.653061 s | 30,591,067.142857 s | 31,465,097.632653 s | 32,339,128.122449 s | 33,213,158.612245 s | 34,087,189.102041 s | 34,961,219.591837 s | 35,835,250.081633 s | 36,709,280.571429 s | 37,583,311.061224 s | 38,457,341.55102 s | 39,331,372.040816 s | 40,205,402.530612 s | 41,079,433.020408 s | 41,953,463.510204 s | 42 827 494 s | 43,701,524.489796 s | 44,575,554.979592 s | 45,449,585.469388 s | 46,323,615.959184 s | 47,197,646.44898 s | 48,071,676.938776 s | 48,945,707.428571 s | 49,819,737.918367 s | 50,693,768.408163 s | 51,567,798.897959 s | 52,441,829.387755 s | 53,315,859.877551 s | 54,189,890.367347 s | 55,063,920.857143 s | 55,937,951.346939 s | 56,811,981.836735 s | 57,686,012.326531 s | 58,560,042.816327 s | 59,434,073.306122 s | 60,308,103.795918 s | 61,182,134.285714 s | 62,056,164.77551 s | 62,930,195.265306 s | 63,804,225.755102 s | 64,678,256.244898 s | 65,552,286.734694 s | 66,426,317.22449 s | 67,300,347.714286 s | 68,174,378.204082 s | 69,048,408.693878 s | 69,922,439.183673 s | 70,796,469.673469 s | 71,670,500.163265 s | 72,544,530.653061 s | 73,418,561.142857 s | 74,292,591.632653 s | 75,166,622.122449 s | 76,040,652.612245 s | 76,914,683.102041 s | 77,788,713.591837 s | 78,662,744.081633 s | 79,536,774.571429 s | 80,410,805.061224 s | 81,284,835.55102 s | 82,158,866.040816 s | 83,032,896.530612 s | 83,906,927.020408 s | 84,780,957.510204 s | 85 654 988 s | 86,529,018.489796 s | 87,403,048.979592 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 ≈ 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) |
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 |
| 1 speed of lights ≈ 874,030.4897959 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 1.1441248465297 × 10-6 speed of lights |