一、引言在目前国际单位制的广泛更新中,有4个基本单位将重新定义,其中千克的重新定义尤为关键。本文比较两个可能方案的优缺点:基于固定普朗克常数值的“电子千克”和基于固定阿伏伽德罗常数值的“原子千克”。千克是质量单位,它等于千克国际原器的质量。这个定义是基于1889年第一届国际计量大会通过的唯一的铂铱圆柱体的定义。虽 I. INTRODUCTION In the current extensive updating of the SI system, four basic units will be redefined. The redefinition of the kilograms is particularly crucial. This article compares the pros and cons of two possible solutions: “electronic kilograms” based on constant Planck’s constant values ​​and “atomic kilograms” based on fixed Avogadro’s constant values. Kg is the unit of mass, which is equal to the mass of a kilogram of international prototype. This definition is based on the definition of the only platinum iridium cylinder adopted at the first International Conference on Metrology in 1889. although