阿伏加德罗常数是将微观粒子(分子、原子、离子、电子等)跟宏观计量联系起来的一个重要常数,起着桥梁的作用。阿伏加德罗常数用N_A表示,它是以0.012 kg~(12)C中所含的碳原子数为标准的规定值,该常数是定义“摩尔”的标准,N_A不是纯数,其单位是mol~(-1)。根据实验测定,0.012kg~(12)C中约含有6.02×10~(23)个碳原子。由此可见阿伏加德罗常数是一规定值,不含任何误差的意义,而6.02× Avogadro’s constant is an important constant that connects microscopic particles (molecules, atoms, ions, electrons, etc.) with macro-metrology and serves as a bridge. The avogadroic constant is expressed as N_A, which is a value specified by the number of carbon atoms contained in 0.012 kg to (12) C, which defines the “mole”, N_A is not a pure number, The unit is mol ~ (-1). According to the experiment, 0.012kg ~ (12) C contains about 6.02 × 10 ~ (23) carbon atoms. This shows that the Avogadro constant is a specified value, does not contain any significance of the error, and 6.02 ×