what is the definition of 1 metre
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Metre is the length of the path travelled by light in vacuum during a time interval of 1/3× of a second.
And when you measure length of anything let's say it's 1 metre then it means the length is 1 times the unit 'metre'.
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The effect of this definition is that one metre is the length of the path travelled by light in vacuum during a time interval with duration of 1/299 792 458 of a second.
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