Following the completion of the first key comparison of realizations of the kilogram, CCM.M-K8.2019, the internationally coordinated dissemination of the kilogram has entered into a new phase on 1 February 2021. The traceability of the mass unit to the Planck constant will now be taken from the ‘consensus value’ of the kilogram. This letter provides the background on the phases of the dissemination of the kilogram and describes the determination of the consensus value and its consequences for mass traceability.

中文翻译：

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公斤传播新阶段的开始

继千克实现的第一次关键比较 CCM.M-K8.2019 完成后，千克的国际协调传播已于 2021 年 2 月 1 日进入新阶段。 质量单位到普朗克常数的可追溯性现在将取自千克的“共识值”。这封信提供了公斤传播阶段的背景，并描述了共识值的确定及其对质量可追溯性的影响。