Metre per second


Metre per second

Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds.

The official SI symbolic abbreviation is m·s−1, or equivalently either m/s or \tfrac{\mbox{m}}{\mbox{s}}.[1] Where metres per second are several orders of magnitude too slow to be convenient, such as in astronomical measurements, velocities may be given in kilometres per second, where 1 km/s is 1000 metres per second.

Contents

Conversions

1 m/s is equivalent to:

= 3.6 km·h−1 (exactly)
≈ 3.2808 feet per second (approximately)
≈ 2.2369 miles per hour (approximately)
≈ 1.9438 knots (approximately)

1 foot per second = 0.3048 m·s−1 (exactly)

1 mile per hour = 0.44704 m·s−1 (exactly)

km·h-1 ≈ 0.2778 m·s−1 (approximately)

1 kilometre per second is equivalent to:

≈ 0.6213 miles per second (approximately)
≈ 2237 miles per hour (approximate)

Relation to other measures

Although m·s−1 is an SI derived unit, it could be viewed as more fundamental than the metre, since the latter is derived from the speed of light in a vacuum, which is defined as exactly 299 792 458 m·s−1 by the BIPM.[2] It follows that one metre is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of one second.

See also

References

External links


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Look at other dictionaries:

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  • Metre per second — …   Википедия

  • Metre per second squared — The metre (or meter) per second squared is the unit of acceleration in the International System of Units (SI). As a derived unit it is composed from the SI base units of length, the metre, and the standard unit of time, the second. Its symbol is… …   Wikipedia

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  • Metre per hour — (American spelling: meter per hour) is a metric unit of both speed (scalar) and velocity (Vector (geometry)). Its symbol is m/h or m·h−1 (not to be confused with the imperial unit symbol mph. By definition, an object travelling at a speed of 1… …   Wikipedia


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