KILOMETRES PER HOUR

'Kilometres per hour' (American English: 'kilometers per hour') is a unit of both speed (scalar) and velocity (vector). The unit symbol is 'km/h' or 'km·h⁻¹'. The incorrect abbreviations "kph" and "kmph" are sometimes also seen in English-speaking countries, in analogy to mph. In North American slang and military usage, km/h (as well as km) is commonly pronounced, and sometimes even written, as 'klicks' or 'kays' (K's).
By definition, an object travelling at a speed of 1 km/h in a straight line for 1 hour moves 1 kilometre.
The km/h is the worldwide most commonly used speed unit on road signs and car speedometers. Therefore, it is far more common in everyday usage than the proper SI unit of speed, m/s. Along with the kWh, km/h is the most commonly used metric unit based on the hour, which is only a "non-SI unit accepted for use with the International System of Units" by the BIPM.^[1]

Contents

Conversions

See also

References

External links

Conversions

★ 3.6 km/h ≡ 1 m/s, the SI derived unit of speed, metre per second

★ 1 km/h ≈ 0.277 78 m/s

★ 1 km/h ≈ 0.621 37 mph ≈ 0.911 34 feet per second

★ 1 knot ≡ 1.852 km/h (exactly)

★ 1 mile = 1.609344 km (~1.61 km)^[2]

★ 1 mile per hour = ~1.61 kilometers per hour
★ kph

★ 1 kilometer per hour = ~0.62 miles per hour
★ mph

See also

★ Orders of magnitude (speed)

References

1. BIPM brochure (SI reference)
2.
Converting a mile to kilometres: with 1 inch = 2.54 cm,
centimeters per mile = 5280 ft
★ 12 inches/ft
★ 2.54 cm/inch
= 160934.4 cm, then dividing by 100_000 cm in 1 km,
1 mile = 1.609344 km.

External links

★ The converter Online conversions for speed units: km/h, mph, knots, etc.

★ Conversion Calculator for Units of Speed