Quantum SI: The New System of Units

TL;DR

This paper provides an overview of the redefined International System of Units (SI), detailing the process of establishing new fundamental standards like the kilogram linked to the Planck constant, and explaining the procedural steps involved.

Contribution

It offers a comprehensive overview of the new SI system, including historical context, procedural setup, and specific details on how units like the kilogram were redefined.

Findings

The kilogram is now fixed by the Planck constant.

The paper details the procedural steps for establishing measurement standards.

Provides a timeline of the SI system evolution.

Abstract

This article gives an overview of the new SI and a few details as to how its setting up was achieved. Those interested in the story of how the kilogram was fixed by tying it to the Planck constant can go straight to section five. Otherwise, apart from the introduction given as section one which also presents excerpts from the relevant official documents on key aspects of the new system, section two gives a brief timeline of the history of the decimal metric system, section three gives a few details of the procedural steps -- from the setting up of a standard of measurement to its percolation to the public, taking the time standard as an example and, section four attempts to give a flavour of the actual process of the setting up of a standard.