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**Speed**** (velocity) ***v* = distance *d / * time *t*

**This program converts English and American measures to metric units**

**• ****Conversions**** of ****velocity**** or ****speed units**** •**

There are really no kmh. Correct is kilometer per hour, that is km/h.

Definition: 1 knot = 1 nautical mile per hour = 5080 feet per hour = 1.852 km/h = 0.514444 m/s.

Mach number (Ma) (pronounced in British English with a Germanic ch, as "mack" or "mark"and as "mock" in American English) is defined as a ratio of the speed of an object or flow relative to the speed of sound in the medium through which it is travelling: v_{0}/v_{s}, where v_{0}is the speed of the object and v_{s} is the speed of sound in the medium.The speed of sound is much temperature dependent. Look here at the bottom. |

**Conversions of many more velocity and speed units**

**Speed and velocity conversion chart**

To convert from: | to: | multiply by: |

foot per hour (ft/h) | meter per second (m/s) | 8.466 667×10^{-5} |

foot per minute (ft/min) | meter per second (m/s) | 5.08×10^{-3} |

foot per second (ft/s) | meter per second (m/s) | 3.048×10^{-1} |

inch per second (in/s) | meter per second (m/s) | 2.54×10^{-2} |

kilometer per hour (km/h) | meter per second (m/s) | 2.777 778×10^{-1} |

knot (nautical mile per hour) | meter per second (m/s) | 5.144 444×10^{-1} |

mile per hour (mi/h) | meter per second (m/s) | 4.470 4×10^{-1} |

mile per hour (mi/h) | kilometer per hour (km/h) | 1.609 344 |

mile per minute (mi/min) | meter per second (m/s) | 2.682 24×10^{+1} |

mile per second (mi/s) | meter per second (m/s) | 1.609 344×10^{3} |

revolution per minute (rpm) (r/min) | radian per second (rad/s) | 1.047 198×10^{-1} |

rpm (revolution per minute) (r/min) | radian per second (rad/s) | 1.047 198×10^{-1} |

**Speed (velocity) units conversion chart**

**Sorted from slow to fast **

Name of speed unit, v |
Relation to SI unit metre/second, m/s |

metre per second | ≡ 1 m/s |

foot per hour; fph; ft/h | ≈ 8.466 667×10^{-5} m/s |

furlong per fortnight | ≈ 1.663 095×10^{-4} m/s |

inch per minute; ipm; in/min | ≈ 4.233 333 333×10^{-4} m/s |

foot per minute; fpm; ft/min | ≡ 5.08×10^{-3} m/s |

inch per second; ips; in/s | ≡2.54×10^{-2} m/s |

kilometre per hour; km/h | ≈ 2.777 777 778×10^{-1} m/s |

foot per second; fps; ft/s | ≡ 3.048×10^{-1} m/s |

mile per hour; mph; mi/h | ≡ 0.447 04 m/s |

statute mile per hour; mph | ≈ 0.447 041 m/s |

knot; kn; NM/h | ≡ 1.852 km/h ≈ 0.514 444 m/s |

knot (Admiralty); kn | ≡ 1.853 184 km/h ≈ 0.514 773 m/s |

mile per minute; mpm; mi/min | ≡ 26.8224 m/s |

mile per second; mps; mi/s | ≡ 1.609 344 km/s |

speed of light in vacuum; c |
≡ 2.997 924 58×10^{8} m/s |

NM = nautical mile.

knot, international (kt) | = 0,514444 m/s |

knot (imperial knot) | = 0,514772 m/s |

knot (US knot) | = 0,514791 m/s |

1 mile nautical/h | = 1 knot |

1 mach number at 0°C | = 1192 km/h |

1 mach number at 20°C | = 1236 km/h |

**Difference between speed and velocity**

Speed is a distance an object goes. Velocity is a measurement of speed and direction. Speed is a scalar quantity - it only has magnitude. Velocity is a vector quantity - it has both magnitude and direction. |

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