Define standard meter.
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The standard metre is the length of the path travelled by light in vaccum during a time interval of 1/299792458 of a second.
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A metre was originally defined in the year 1889 as the distance between two marks on a platinum iridium ( an alloy with 90% platinum and 10% iridium ) rod kept at 0° C in the international Bureau of Weights and Measures at Sevres near Paris .
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