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  • 11:24, 9 November 2021 (diff | hist) . . (+4)‎ . . 2520: Symbols ‎ (→‎Explanation: Avogadro's Number explained in its first SI definition from 1971. 1 gram of matter is incorrect, because its the number of molecules to their weight ratio, and 'matter' means every thinkable compount.)

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