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一米有多长?论凝聚态物理在国际标准单位制中的关键作用
至于阿伏加德罗常数NA,它是用于标准化样品中以摩尔为单位的归一化因子。这个数以前是质量为12克的碳-12中原子的数目。这个量现在是国际单位制中的定义常数。虽然阿伏加德罗常数NA曾在科学发展过程中起到了积极作用,但现在它更多的是承接科学发展的连贯性。在 ...
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