define length and write SI unit of length
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Explanation:
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 s-1, where the second is defined in terms of ΔνCs.
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Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance.
THE SI UNIT OF LENGTH IS METRE (m).
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