Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The correct SI symbol is km/h or km·h⁻¹, although the unit is sometimes written colloquially as kph, kmph, or km/hr. None of these corruptions is correct under the rules of SI in reference to correct style when using symbols. It is often spoken and sometimes written as klicks or kays in slang usage. A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... The hour was originally defined in Egypt as 1/24 of a day, based on their duo-decimal numbering system (which counted finger joints on each hand). ... American English or U.S. English is the form of the English language used mostly in the United States of America. ... In physics and metrology, units are standards for measurement of physical quantities that need clear definitions to be useful. ... Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t. ... Scalar is a concept that has meaning in mathematics, physics, and computing. ... Velocity (symbol: v) is a vector measurement of the rate and direction of motion. ... In physics and engineering, the word vector typically refers to a quantity that has close relationship to the spatial coordinates, informally described as an object with a magnitude and a direction. The word vector is also now used for more general concepts (see also vector and generalizations below), but this... Slang is the non-standard use of words in a language of a particular social group, and sometimes the creation of new words or importation of words from another language. ...

By definition, an object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

• 3.6 km/h ≡ 1 m·s⁻¹, the SI derived unit of speed, metre per second
• 1 km/h ≈ 0.27778 m/s
• 1 km/h ≈ 0.62137 mph ≈ 0.91134 foot per second

The metre, symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... This article is about the unit of time. ... SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ... Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ... Miles per hour is a unit of speed, expressing the number of international miles covered per hour. ... Foot (unit of length) - Wikipedia /**/ @import /skins-1. ...

Examples of speeds in km/h

This racing bicycle is built using lightweight, shaped aluminum tubing and carbon fiber stays and forks. ... A speed limit is the maximum speed allowed by law for vehicles on a road. ... This article deals with the African herbivorous mammal. ... Binomial name Acinonyx jubatus (Schreber, 1775) The Cheetah (Acinonyx jubatus) is an atypical member of the cat family (Felidae) that hunts by speed rather than by stealth or pack tactics. ... Japan]s Shinkansen trains began the development of modern high-speed railways (shown here JR West 500 Series Shinkansen at Kyoto). ... An airliner is a large fixed-wing aircraft (an aeroplane/airplane) initially designed for the transport of paying passengers, and usually operated by an airline company (which owns or leases the aircraft). ... The speed of sound c (from Latin celeritas, velocity) varies depending on the medium through which the sound waves pass. ... 1970 land speed record being set at Bonneville Salt Flats by Gary Gabelich Land Speed Records 1898-2002 The information below is for self-propelled wheeled vehicles travelling over open ground. ... The Space Shuttle Columbia seconds after engine ignition, 1981 (NASA). ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... Cherenkov effect in a swimming pool nuclear reactor. ...

External links

• Conversion Calculator for Units of SPEED