アボガドロ数
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定義
1モルの物質に含まれる基本粒子（原子、分子、イオン）の正確な数：6.02214076 × 10²³ /mol。
解説
One mole of carbon-12 atoms weighs exactly 12 grams and contains 6.022 × 10²³ atoms. This enormous number bridges atomic-scale masses and laboratory-scale masses: one water molecule has a mass of 2.99 × 10⁻²⁶ kg, but one mole of water (18.015 g) is easily measured on a balance. Since 2019, Avogadro’s number is fixed by definition, making the mole independent of any physical artifact.
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