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Definition: speed (velocity) = path / time; v = d / t; d = distance, t = time
The SI unit of speed is meter per second (m/s). Another unit is kilometer per hour
Conversions of other velocity or speed units
Velocity conversion table
| Unit Name | Symbol | SI Equivalent m/s |
| benz | Bz | 1 m/s |
| centimeter per minute | cm/min | 1.66667×10−4 m/s |
| centimeter per second | cm/s | 1×10−2 m/s |
| foot per hour | ft/h, fph | 8.46667×10−5 m/s |
| foot per minute | ft/min, fpm | 5.08×10−3 m/s |
| foot per second | ft/s, fps | 0.3048 m/s |
| furlong per fortnight | furlong/fortnight | 1.66309×10−4 m/s |
| inch per second | in/s, ips | 2.54×10−2 m/s |
| kilometer per hour | km/h | 0.277778 m/s |
| knot (noeud) | kn, knot | 0.514444 m/s |
| kyne | cm/s | 1×10−2 m/s |
| meter per minute | m/min | 1.66667×10−2 m/s |
| meter per second | m/s | 1 m/s |
| mil per year | mpy | 8.04327×10−13 m/s |
| mile (naut.) per hour (knot, noeud) | 0.514444 m/s | |
| mile (stat.) per hour | mph, mi/h | 0.44704 m/s |
| mile (stat.) per minute | mi/min | 26.8224 m/s |
| millimeter per minute | mm/min | 1.66667×10−5 m/s |
| millimeter per second | mm/s | 1×10−3 m/s |
| speed of light c | m/s | 2.99792458×10+8 m/s |
| speed of sound c | m/s | 343 m/s at 20°C in air |
There are really no kmh. Correct is kilometer per hour, that is km / h.
Speed of sound and acoustic velocity
| Speed is the rate of change of distance with time. Velocity is a measure of both speed and direction of a moving object. Velocity is the rate of change of displacement with time. Speed is a distance an object goes, velocity is measurment of speed AND direction. |
| In a given ideal gas the sound speed depends only on its temperature. The speed of sound in still air at 0 degrees Celsius is 331.3 m/s. It depends on the temperature, and the material. Since sound is more easily transmitted between close molecules, it travels faster in the denser substance. Thus the speed of sound increases with the stiffness of the material. |
| In conventional use and in scientific literature sound velocity is the same as speed of sound or acoustic velocity.Sound velocity c should not be confused with sound particle velocity v, which is the velocity of the individual particles. |
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