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据英国《每日邮报》报道,或许因铸造时锁定在内部的气体消失的缘故,存放于法国塞夫勒市国际计量局中的国际千克原器(一个铂铱合金的圆柱体作为1千克的标准重量,见左图)出现质量减少的现象。基于这一物理学常量再也难以继续作为精确的基本衡量单位,科学家们决定使有以普朗克常数为基础的一种全新千克定义,以取代国际千克原器。然而,以普朗克常数为基础的全新千克定义,首先需要对阿伏伽德罗常数进行评估。为此,法国国家计量科学研究院的科学家通过统计1千克纯硅球体的原子
According to the British “Daily Mail” reported that due to the disappearance of the gas trapped in the interior during casting, the international kilogram stored in the International Bureau of Measurement in Sèvres, France (a platinum-iridium cylinder as a kilogram Standard weight, see left) appears to reduce the quality of the phenomenon. Based on this constant of physics it is no longer easy to continue as an accurate basic measure, and scientists decided to replace the international one with a new definition of a kilogram based on the Planck’s constant. However, the new kilogram definition based on the Planck’s constant first requires an evaluation of Avogadro’s number. To this end, the French National Institute of Metrology scientist statistics by 1 kg pure silica spheres atoms