How is one metre length define in SI system?
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1. User Answers cgarciame27
Answer:
The meter, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s1, where the second is defined in terms of ΔνCs. The kilogram, symbol kg, is the SI unit of mass.
Explanation:
physics.nist.com

2. User Answers safalpathak101
Explanation:
The metre is currently defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. The metre was originally defined in 1793 as one tenmillionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.