Taylor Barry N
National Institute of Standards and Technology, Gaithersburg, MD 20899-8420, USA.
J Res Natl Inst Stand Technol. 2018 Jun 5;123:1-12. doi: 10.6028/jres.123.008. eCollection 2018.
A revised International System of Units (SI) is expected to be established by the 26th General Conference on Weights and Measures when it convenes in November 2018 and to be put into practice starting on 20 May 2019, World Metrology Day. In consequence, the article published in this journal in 2011, "The Current SI Seen from the Perspective of the Proposed New SI," is updated in this paper, which provides an opportunity to again demonstrate the usefulness of the quantity calculus in dealing with quantities and units. The quantity calculus and the seven defining constants of the current and revised SI are reviewed, and expressions for the seven current and revised SI base units are given. Relationships between the magnitudes of revised and current SI units and expressions for the numerical values of current SI defining constants expressed in revised SI units are also obtained using the quantity calculus.
预计修订后的国际单位制（SI）将在2018年11月召开的第26届国际计量大会上确立，并于2019年5月20日世界计量日起开始实施。因此，本文对2011年发表在本期刊上的文章《从拟议的新国际单位制视角看现行国际单位制》进行了更新，这提供了一个机会来再次展示量值演算在处理量和单位方面的有用性。本文回顾了量值演算以及现行和修订后国际单位制的七个定义常数，并给出了七个现行和修订后国际单位制基本单位的表达式。还用量值演算得出了修订后和现行国际单位制单位量值之间的关系，以及用修订后国际单位制单位表示的现行国际单位制定义常数数值的表达式。
