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Elle Holloway
History
21 September, 19:31
What is the current basis of the meter (1983) ?
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Perla Shaw
21 September, 19:34
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The meter is defined as the distance that light travels in 1/299 792 458 of a second in a vacuum. This basis is accurate because the speed of light is constant in a vacuum, by Einstein's theory of relativity.
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