基于自然常数的国际单位制重新定义

Redefinition of International System of Units Based on Constants of Nature

第26届国际计量大会批准了全部以自然常数重新定义的国际单位制(SI)。新定义不再依赖任何实物计量基准,使国际单位制更具稳定性和普适性。文章介绍了国际单位制的沿革和重新定义的国际单位制的内容。

The 26th meeting of the General Conference on Weights and Measures (CGPM) approved the revision of the international system of units (SI). The definitions of all the units of the revised SI have been linked to constants of nature, which no longer rely on any physical artifacts and guarantee their stability and universality. This paper introduces the evolution of and the content of the redefined SI.