| yard per hour | 1 ydph | 2 ydph | 3 ydph | 4 ydph | 5 ydph | 6 ydph | 7 ydph | 8 ydph | 9 ydph | 10 ydph | 11 ydph | 12 ydph | 13 ydph | 14 ydph | 15 ydph | 16 ydph | 17 ydph | 18 ydph | 19 ydph | 20 ydph | 21 ydph | 22 ydph | 23 ydph | 24 ydph | 25 ydph | 26 ydph | 27 ydph | 28 ydph | 29 ydph | 30 ydph | 31 ydph | 32 ydph | 33 ydph | 34 ydph | 35 ydph | 36 ydph | 37 ydph | 38 ydph | 39 ydph | 40 ydph | 41 ydph | 42 ydph | 43 ydph | 44 ydph | 45 ydph | 46 ydph | 47 ydph | 48 ydph | 49 ydph | 50 ydph | 51 ydph | 52 ydph | 53 ydph | 54 ydph | 55 ydph | 56 ydph | 57 ydph | 58 ydph | 59 ydph | 60 ydph | 61 ydph | 62 ydph | 63 ydph | 64 ydph | 65 ydph | 66 ydph | 67 ydph | 68 ydph | 69 ydph | 70 ydph | 71 ydph | 72 ydph | 73 ydph | 74 ydph | 75 ydph | 76 ydph | 77 ydph | 78 ydph | 79 ydph | 80 ydph | 81 ydph | 82 ydph | 83 ydph | 84 ydph | 85 ydph | 86 ydph | 87 ydph | 88 ydph | 89 ydph | 90 ydph | 91 ydph | 92 ydph | 93 ydph | 94 ydph | 95 ydph | 96 ydph | 97 ydph | 98 ydph | 99 ydph | 100 ydph |
| speed of sound (32 °F) | 7.6690821256039 × 10-7 s | 1.5338164251208 × 10-6 s | 2.3007246376812 × 10-6 s | 3.0676328502415 × 10-6 s | 3.8345410628019 × 10-6 s | 4.6014492753623 × 10-6 s | 5.3683574879227 × 10-6 s | 6.1352657004831 × 10-6 s | 6.9021739130435 × 10-6 s | 7.6690821256039 × 10-6 s | 8.4359903381643 × 10-6 s | 9.2028985507246 × 10-6 s | 9.969806763285 × 10-6 s | 1.0736714975845 × 10-5 s | 1.1503623188406 × 10-5 s | 1.2270531400966 × 10-5 s | 1.3037439613527 × 10-5 s | 1.3804347826087 × 10-5 s | 1.4571256038647 × 10-5 s | 1.5338164251208 × 10-5 s | 1.6105072463768 × 10-5 s | 1.6871980676329 × 10-5 s | 1.7638888888889 × 10-5 s | 1.8405797101449 × 10-5 s | 1.917270531401 × 10-5 s | 1.993961352657 × 10-5 s | 2.070652173913 × 10-5 s | 2.1473429951691 × 10-5 s | 2.2240338164251 × 10-5 s | 2.3007246376812 × 10-5 s | 2.3774154589372 × 10-5 s | 2.4541062801932 × 10-5 s | 2.5307971014493 × 10-5 s | 2.6074879227053 × 10-5 s | 2.6841787439614 × 10-5 s | 2.7608695652174 × 10-5 s | 2.8375603864734 × 10-5 s | 2.9142512077295 × 10-5 s | 2.9909420289855 × 10-5 s | 3.0676328502415 × 10-5 s | 3.1443236714976 × 10-5 s | 3.2210144927536 × 10-5 s | 3.2977053140097 × 10-5 s | 3.3743961352657 × 10-5 s | 3.4510869565217 × 10-5 s | 3.5277777777778 × 10-5 s | 3.6044685990338 × 10-5 s | 3.6811594202899 × 10-5 s | 3.7578502415459 × 10-5 s | 3.8345410628019 × 10-5 s | 3.911231884058 × 10-5 s | 3.987922705314 × 10-5 s | 4.06461352657 × 10-5 s | 4.1413043478261 × 10-5 s | 4.2179951690821 × 10-5 s | 4.2946859903382 × 10-5 s | 4.3713768115942 × 10-5 s | 4.4480676328502 × 10-5 s | 4.5247584541063 × 10-5 s | 4.6014492753623 × 10-5 s | 4.6781400966184 × 10-5 s | 4.7548309178744 × 10-5 s | 4.8315217391304 × 10-5 s | 4.9082125603865 × 10-5 s | 4.9849033816425 × 10-5 s | 5.0615942028986 × 10-5 s | 5.1382850241546 × 10-5 s | 5.2149758454106 × 10-5 s | 5.2916666666667 × 10-5 s | 5.3683574879227 × 10-5 s | 5.4450483091787 × 10-5 s | 5.5217391304348 × 10-5 s | 5.5984299516908 × 10-5 s | 5.6751207729469 × 10-5 s | 5.7518115942029 × 10-5 s | 5.8285024154589 × 10-5 s | 5.905193236715 × 10-5 s | 5.981884057971 × 10-5 s | 6.0585748792271 × 10-5 s | 6.1352657004831 × 10-5 s | 6.2119565217391 × 10-5 s | 6.2886473429952 × 10-5 s | 6.3653381642512 × 10-5 s | 6.4420289855072 × 10-5 s | 6.5187198067633 × 10-5 s | 6.5954106280193 × 10-5 s | 6.6721014492754 × 10-5 s | 6.7487922705314 × 10-5 s | 6.8254830917874 × 10-5 s | 6.9021739130435 × 10-5 s | 6.9788647342995 × 10-5 s | 7.0555555555556 × 10-5 s | 7.1322463768116 × 10-5 s | 7.2089371980676 × 10-5 s | 7.2856280193237 × 10-5 s | 7.3623188405797 × 10-5 s | 7.4390096618357 × 10-5 s | 7.5157004830918 × 10-5 s | 7.5923913043478 × 10-5 s | 7.6690821256039 × 10-5 s |
Yards per hour (abbreviated mph, YDPH or yd/h) is an imperial and United States customary unit of speed expressing the number of statute yards covered in one hour.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| yard per hour | ydph | ≡ 1 yd/h | = 0.000254 m/s | Imperial/US |
| yards per hour | speed of sounds (32 °F) | yards per hour | speed of sounds (32 °F) |
|---|---|---|---|
| 1 | ≈ 7.6690821256039E-7 | 6 | ≈ 4.6014492753623E-6 |
| 2 | ≈ 1.5338164251208E-6 | 7 | ≈ 5.3683574879227E-6 |
| 3 | ≈ 2.3007246376812E-6 | 8 | ≈ 6.1352657004831E-6 |
| 4 | ≈ 3.0676328502415E-6 | 9 | ≈ 6.9021739130435E-6 |
| 5 | ≈ 3.8345410628019E-6 | 10 | ≈ 7.6690821256039E-6 |
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.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| speed of sound (32 °F) | s | 225 to 1062 km/h (761–660 mph or 661–574 kn) | ≈ 340 to 295 m/s | Other Speed |
| speed of sounds (32 °F) | yards per hour | speed of sounds (32 °F) | yards per hour |
|---|---|---|---|
| 1 | ≈ 1303937.007874 | 6 | ≈ 7823622.0472441 |
| 2 | ≈ 2607874.015748 | 7 | ≈ 9127559.0551181 |
| 3 | ≈ 3911811.023622 | 8 | ≈ 10431496.062992 |
| 4 | ≈ 5215748.0314961 | 9 | ≈ 11735433.070866 |
| 5 | ≈ 6519685.0393701 | 10 | ≈ 13039370.07874 |
| yards per hour | speed of sounds (32 °F) |
|---|---|
| 1 | ≈ 7.6690821256039 × 10-7 |
| 1,303,937.007874 | ≈ 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |