NPL Image with title "The Redefinition of the SI" which was part of a set of talks titled "The Measure of all Things"

Redefining the Kilogram, the Kelvin, the Ampere and the Mole: Why you should care even though you won't notice

Talk by: Michael de Podesta (NPL)

Progress in science and engineering is often linked to progress in metrology. If we cannot measure something then we cannot begin to understand it (science) or improve it (engineering). And better measurement leads to better understanding and control.

Measurement is the quantitative comparison of an unknown quantity with a standard. In the International System of Units - the 'SI' - there are seven standard quantities called the 'base units': the second, metre, kilogram, ampere, kelvin, candela and mole. The perfection with which these definitions can be made real, represents a fundamental limit to achievable measurement uncertainty.

Image: © NPL

19 Mar 2019 19:30 to 20:45
Sarum College
Salisbury SP1 2EE
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