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Velocity and Speed

Characteristic

atomic-unit-of-velocity

Notes

Metric (SI) Equivalent

2.1876912638×106 meters / second

Standard Uncertainty

± 7.1×10-4 meters / second

Metric (SI) Dimensions

length × time-1

Characteristic

kilometer-per-hour

Notes

Other Name

kph

Metric (SI) Equivalent

1 kilometer / hour

This equivalent and the one below are calculated from exact values.

Another Metric (SI) Equivalent with More Basic Units

0.27777777778 meters / second

Metric (SI) Dimensions

length × time-1

Description in Terms of Other Units and Constants

1000 meters / hour

Characteristic

kine

Notes

Metric (SI) Equivalent

1 centimeter / second

This equivalent is exact.

Metric (SI) Dimensions

length × time-1

Characteristic

knot

( U.S. and international unit )

Notes

Symbol

kn

Other Names

nautical-mile-per-hour, nmph, kt

Metric (SI) Equivalent

1.852 kilometers / hour

This equivalent and the one below are calculated from exact values.

Another Metric (SI) Equivalent with More Basic Units

0.51444444444 meters / second

Metric (SI) Dimensions

length × time-1

Description in Terms of Other Units and Constants

nautical-mile / hour

Unit Group

knot Group

Characteristic

knot-UK

( Used in the United Kingdom )

Notes

Other Names

kn-UK, nautical-mile-per-hour-UK, nmph-UK, kt-UK

Metric (SI) Equivalent

1.853172 kilometers / hour

This equivalent and the one below are exact.

Another Metric (SI) Equivalent with More Basic Units

0.51477 meters / second

Metric (SI) Dimensions

length × time-1

Unit Group

knot Group

Characteristic

mile-per-hour

Notes

Symbol

mph

Metric (SI) Equivalent

1.609344 kilometers / hour

This equivalent and the one below are calculated from exact values.

Another Metric (SI) Equivalent with More Basic Units

0.44704 meters / second

Metric (SI) Dimensions

length × time-1

Description in Terms of Other Units and Constants

mile / hour

Characteristic

speed-of-light-in-vacuum

Notes

Symbol

c

Other Names

c-0, natural-unit-of-velocity

Metric (SI) Equivalent

1.0792528488×109 kilometers / hour

This equivalent and the one below are exact.

Another Metric (SI) Equivalent with More Basic Units

2.99792458×108 meters / second

Metric (SI) Dimensions

length × time-1