SI Prefix expansion

In November 2022, measurement scientists and government representatives from around the world voted at the General Conference on Weights and Measures (CGPM) to expand the range of prefixes used within the International System of Units (SI).

This decision means that four new prefixes (two at the top end of the SI range and two at the bottom end of the SI range) can now be used to express measurements worldwide. This is the first expansion to the SI prefix range since 1991.

Find out more: https://www.npl.co.uk/si-prefix

About Us

The National Physical Laboratory (NPL) is the UK's National Metrology Institute (NMI), developing and maintaining the national primary measurement standards, as well as collaborating with other NMIs to maintain the international system of measurement. As a public sector research establishment, we deliver extraordinary impact by providing the measurement capability that underpins the UK's prosperity and quality of life. We develop the metrology required to ensure the timely and successful deployment of new technologies and work with organisations as they develop and test new products and processes.

https://www.npl.co.uk/about-us