The measure of all things: redefinition of the kilogram, the kelvin, the ampere and the mole

Speaker: Dr Bajram Zeqiri (NPL)

Measurement lies at the heart of all science and engineering with progress in these disciplines often linked to advances in the science of measurement (metrology). In the International System of Units – the ‘SI’ System – there are seven standard quantities which are called ‘base units’: the second, metre, kilogram, ampere, kelvin, candela and mole. The perfection to which these definitions can be realised provides a fundamental limit to achievable measurement uncertainty. On 20 May 2019, to remove these limits, there was a subtle but important redefinition of four of these base units – the kilogram, ampere, kelvin and mole.  This talk will explain the rationale for these profound changes.

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Organised By
London and South East Branch
02 Jun 2021 18:00 to 19:00
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