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  2. Miles per hour - Wikipedia

    en.wikipedia.org/wiki/Miles_per_hour

    Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour.It is used in the United Kingdom, the United States, and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.

  3. Kilometres per hour - Wikipedia

    en.wikipedia.org/wiki/Kilometres_per_hour

    Abbreviations for "kilometres per hour" did not appear in the English language until the late nineteenth century. The kilometre, a unit of length, first appeared in English in 1810, [9] and the compound unit of speed "kilometers per hour" was in use in the US by 1866. [10] "Kilometres per hour" did not begin to be abbreviated in print until ...

  4. Knot (unit) - Wikipedia

    en.wikipedia.org/wiki/Knot_(unit)

    1.15078 miles per hour (approximately), 20.25372 inches per second (approximately) 1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m. The US adopted the international definition in 1954, having previously used the US nautical mile (1 853.248 m). [6]

  5. Template:Convert/list of units/speed - Wikipedia

    en.wikipedia.org/wiki/Template:Convert/list_of...

    Speed; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: metre per second: m/s m/s US spelling: meter per second 1.0 m/s (3.3 ft/s)

  6. Help:Convert units - Wikipedia

    en.wikipedia.org/wiki/Help:Convert_units

    Metric prefixes; Text Symbol Factor or; yotta Y 10 24: 1 000 000 000 000 000 000 000 000: zetta Z 10 21: 1 000 000 000 000 000 000 000: exa E 10 18: 1 000 000 000 000 000 000: peta P 10 15: 1 000 000 000 000 000: tera T

  7. Indicated airspeed - Wikipedia

    en.wikipedia.org/wiki/Indicated_airspeed

    Some airspeed indicators in aircraft prior to the mid-1970s indicate in miles per hour plus knots (1 knot = 1.15 mph) or kilometers per hour (1 knot = 1.85 km/h). A primary flight display with the indicated airspeed (IAS) displayed in the form of a vertical "tape" on the left.

  8. Template:Speed conversions - Wikipedia

    en.wikipedia.org/wiki/Template:Speed_conversions

    Conversions between common units of speed; m/s km/h mph (mi/h) knot fps (ft/s) 1 m/s = 1: 3.600 000: 2.236 936 * 1.943 844 * 3.280 840 * 1 km/h = 0.277 778 * 1: 0.621 ...

  9. Speed - Wikipedia

    en.wikipedia.org/wiki/Speed

    kilometres per hour (symbol km/h); miles per hour (symbol mi/h or mph); knots (nautical miles per hour, symbol kn or kt); feet per second (symbol fps or ft/s); Mach number (dimensionless), speed divided by the speed of sound; in natural units (dimensionless), speed divided by the speed of light in vacuum (symbol c = 299 792 458 m/s).