| 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 |
| foot per hour | 4,051,181.1023622 fph | 8,102,362.2047244 fph | 12,153,543.307087 fph | 16,204,724.409449 fph | 20,255,905.511811 fph | 24,307,086.614173 fph | 28,358,267.716535 fph | 32,409,448.818898 fph | 36,460,629.92126 fph | 40,511,811.023622 fph | 44,562,992.125984 fph | 48,614,173.228346 fph | 52,665,354.330709 fph | 56,716,535.433071 fph | 60,767,716.535433 fph | 64,818,897.637795 fph | 68,870,078.740157 fph | 72,921,259.84252 fph | 76,972,440.944882 fph | 81,023,622.047244 fph | 85,074,803.149606 fph | 89,125,984.251969 fph | 93,177,165.354331 fph | 97,228,346.456693 fph | 101,279,527.55906 fph | 105,330,708.66142 fph | 109,381,889.76378 fph | 113,433,070.86614 fph | 117,484,251.9685 fph | 121,535,433.07087 fph | 125,586,614.17323 fph | 129,637,795.27559 fph | 133,688,976.37795 fph | 137,740,157.48031 fph | 141,791,338.58268 fph | 145,842,519.68504 fph | 149,893,700.7874 fph | 153,944,881.88976 fph | 157,996,062.99213 fph | 162,047,244.09449 fph | 166,098,425.19685 fph | 170,149,606.29921 fph | 174,200,787.40157 fph | 178,251,968.50394 fph | 182,303,149.6063 fph | 186,354,330.70866 fph | 190,405,511.81102 fph | 194,456,692.91339 fph | 198,507,874.01575 fph | 202,559,055.11811 fph | 206,610,236.22047 fph | 210,661,417.32283 fph | 214,712,598.4252 fph | 218,763,779.52756 fph | 222,814,960.62992 fph | 226,866,141.73228 fph | 230,917,322.83465 fph | 234,968,503.93701 fph | 239,019,685.03937 fph | 243,070,866.14173 fph | 247,122,047.24409 fph | 251,173,228.34646 fph | 255,224,409.44882 fph | 259,275,590.55118 fph | 263,326,771.65354 fph | 267,377,952.75591 fph | 271,429,133.85827 fph | 275,480,314.96063 fph | 279,531,496.06299 fph | 283,582,677.16535 fph | 287,633,858.26772 fph | 291,685,039.37008 fph | 295,736,220.47244 fph | 299,787,401.5748 fph | 303,838,582.67717 fph | 307,889,763.77953 fph | 311,940,944.88189 fph | 315,992,125.98425 fph | 320,043,307.08661 fph | 324,094,488.18898 fph | 328,145,669.29134 fph | 332,196,850.3937 fph | 336,248,031.49606 fph | 340,299,212.59843 fph | 344,350,393.70079 fph | 348,401,574.80315 fph | 352,452,755.90551 fph | 356,503,937.00787 fph | 360,555,118.11024 fph | 364,606,299.2126 fph | 368,657,480.31496 fph | 372,708,661.41732 fph | 376,759,842.51969 fph | 380,811,023.62205 fph | 384,862,204.72441 fph | 388,913,385.82677 fph | 392,964,566.92913 fph | 397,015,748.0315 fph | 401,066,929.13386 fph | 405,118,110.23622 fph |
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) ≈ 4051181.1023622 feet per hour | 6 speed of sounds (68 °F) ≈ 24307086.614173 feet per hour |
| 2 speed of sounds (68 °F) ≈ 8102362.2047244 feet per hour | 7 speed of sounds (68 °F) ≈ 28358267.716535 feet per hour |
| 3 speed of sounds (68 °F) ≈ 12153543.307087 feet per hour | 8 speed of sounds (68 °F) ≈ 32409448.818898 feet per hour |
| 4 speed of sounds (68 °F) ≈ 16204724.409449 feet per hour | 9 speed of sounds (68 °F) ≈ 36460629.92126 feet per hour |
| 5 speed of sounds (68 °F) ≈ 20255905.511811 feet per hour | 10 speed of sounds (68 °F) ≈ 40511811.023622 feet per hour |
Foot per hour is unit of speed or velocity. It equals 0.00008466 meter per second. Plural name is feet / hour.
| 1 feet per hour ≈ 2.4684159378037E-7 speed of sounds (68 °F) | 6 feet per hour ≈ 1.4810495626822E-6 speed of sounds (68 °F) |
| 2 feet per hour ≈ 4.9368318756074E-7 speed of sounds (68 °F) | 7 feet per hour ≈ 1.7278911564626E-6 speed of sounds (68 °F) |
| 3 feet per hour ≈ 7.4052478134111E-7 speed of sounds (68 °F) | 8 feet per hour ≈ 1.974732750243E-6 speed of sounds (68 °F) |
| 4 feet per hour ≈ 9.8736637512148E-7 speed of sounds (68 °F) | 9 feet per hour ≈ 2.2215743440233E-6 speed of sounds (68 °F) |
| 5 feet per hour ≈ 1.2342079689018E-6 speed of sounds (68 °F) | 10 feet per hour ≈ 2.4684159378037E-6 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 4,051,181.1023622 feet per hour |
| 1 feet per hour ≈ 2.4684159378037 × 10-7 speed of sounds (68 °F) |