| speed of sound (32 °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 | 1.1047642832963 × 10-6 c | 2.2095285665926 × 10-6 c | 3.3142928498888 × 10-6 c | 4.4190571331851 × 10-6 c | 5.5238214164814 × 10-6 c | 6.6285856997777 × 10-6 c | 7.733349983074 × 10-6 c | 8.8381142663702 × 10-6 c | 9.9428785496665 × 10-6 c | 1.1047642832963 × 10-5 c | 1.2152407116259 × 10-5 c | 1.3257171399555 × 10-5 c | 1.4361935682852 × 10-5 c | 1.5466699966148 × 10-5 c | 1.6571464249444 × 10-5 c | 1.767622853274 × 10-5 c | 1.8780992816037 × 10-5 c | 1.9885757099333 × 10-5 c | 2.0990521382629 × 10-5 c | 2.2095285665926 × 10-5 c | 2.3200049949222 × 10-5 c | 2.4304814232518 × 10-5 c | 2.5409578515814 × 10-5 c | 2.6514342799111 × 10-5 c | 2.7619107082407 × 10-5 c | 2.8723871365703 × 10-5 c | 2.9828635649 × 10-5 c | 3.0933399932296 × 10-5 c | 3.2038164215592 × 10-5 c | 3.3142928498888 × 10-5 c | 3.4247692782185 × 10-5 c | 3.5352457065481 × 10-5 c | 3.6457221348777 × 10-5 c | 3.7561985632074 × 10-5 c | 3.866674991537 × 10-5 c | 3.9771514198666 × 10-5 c | 4.0876278481962 × 10-5 c | 4.1981042765259 × 10-5 c | 4.3085807048555 × 10-5 c | 4.4190571331851 × 10-5 c | 4.5295335615147 × 10-5 c | 4.6400099898444 × 10-5 c | 4.750486418174 × 10-5 c | 4.8609628465036 × 10-5 c | 4.9714392748333 × 10-5 c | 5.0819157031629 × 10-5 c | 5.1923921314925 × 10-5 c | 5.3028685598221 × 10-5 c | 5.4133449881518 × 10-5 c | 5.5238214164814 × 10-5 c | 5.634297844811 × 10-5 c | 5.7447742731407 × 10-5 c | 5.8552507014703 × 10-5 c | 5.9657271297999 × 10-5 c | 6.0762035581295 × 10-5 c | 6.1866799864592 × 10-5 c | 6.2971564147888 × 10-5 c | 6.4076328431184 × 10-5 c | 6.518109271448 × 10-5 c | 6.6285856997777 × 10-5 c | 6.7390621281073 × 10-5 c | 6.8495385564369 × 10-5 c | 6.9600149847666 × 10-5 c | 7.0704914130962 × 10-5 c | 7.1809678414258 × 10-5 c | 7.2914442697554 × 10-5 c | 7.4019206980851 × 10-5 c | 7.5123971264147 × 10-5 c | 7.6228735547443 × 10-5 c | 7.733349983074 × 10-5 c | 7.8438264114036 × 10-5 c | 7.9543028397332 × 10-5 c | 8.0647792680628 × 10-5 c | 8.1752556963925 × 10-5 c | 8.2857321247221 × 10-5 c | 8.3962085530517 × 10-5 c | 8.5066849813814 × 10-5 c | 8.617161409711 × 10-5 c | 8.7276378380406 × 10-5 c | 8.8381142663702 × 10-5 c | 8.9485906946999 × 10-5 c | 9.0590671230295 × 10-5 c | 9.1695435513591 × 10-5 c | 9.2800199796887 × 10-5 c | 9.3904964080184 × 10-5 c | 9.500972836348 × 10-5 c | 9.6114492646776 × 10-5 c | 9.7219256930073 × 10-5 c | 9.8324021213369 × 10-5 c | 9.9428785496665 × 10-5 c | 0.0001005 c | 0.0001016 c | 0.0001027 c | 0.0001038 c | 0.0001050 c | 0.0001061 c | 0.0001072 c | 0.0001083 c | 0.0001094 c | 0.0001105 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 (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 |
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) |
| 1 speed of sounds (32 °F) ≈ 1.1047642832963 × 10-6 speed of lights |
| 1 speed of lights ≈ 905,170.4649759 speed of sounds (32 °F) |