(the ‘metre’ is defined at the 17th “General Conference on Weights and Measures” as the distance ‘light’ travels in a ‘vacuum’ in 1/299,792,458 of a ‘second’)
(the ‘metre’ is defined at the 17th “General Conference on Weights and Measures” as the distance ‘light’ travels in a ‘vacuum’ in 1/299,792,458 of a ‘second’)
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