The redefinition of mass adopted in November 2018 and implemented from 20 May 2019, i.e. World Metrology Day, eliminated the artefact-based approach dependent upon the International Prototype of the Kilogram (IPK), in favour of realizing the kilogram in terms of the Planck constant h by fixing its value as 6.62607015 × 10⁻³⁴ J s. In this paper, the authors present a general outline of the circumstances and related developments that paved the way for the new definition that replaced the IPK after a period of 130 years since it was formally sanctioned to define the kilogram in 1889. The new definition opens up fascinating developments in mass metrology which include different realization techniques, realizing the unit at values other than 1 kg, numerous sources for traceability can be envisaged etc.

重新定义于2018年11月采用，并自2019年5月20日起实施，即世界计量日，消除了依赖于国际千克原形（IPK）的基于人工制品的方法，支持根据普朗克常数实现千克ħ通过固定它的值作为6.62607015×10 ^-34 Ĵ秒。在本文中，作者介绍了情况和相关发展的总体概况，为自1889年正式批准定义千克以来的130年后的IPK取代IPK的新定义铺平了道路。大规模计量学的引人入胜的发展，其中包括不同的实现技术，将单位实现为非1 kg的值，可以设想许多可追溯性的来源等。