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定义
SI物质的量的基本单位，定义为恰好6.02214076×10²³个基本实体（原子、分子、离子等）。
解释
One mole of carbon-12 atoms has a mass of exactly 12 grams. The number 6.02214076×10²³ is Avogadro's number, fixed by the 2019 SI redefinition. A mole of water molecules (18 g) fits in about 18 mL — a tablespoon. Chemists use moles because atoms are too small to count individually, but a mole provides a practical laboratory-scale quantity.
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