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Vacuum and cryogenics

Vacuum and cryogenics

Redefining temperature

08 Aug 2013

Michael de Podesta recounts the six-year experiment that has yielded the most accurate temperature measurement ever made – a result that is expected to help redefine the kelvin

Photo of a concave copper hemisphere, with bolt holes around its rim, which is so shiny it reflects the camera and photographer
Mirror perfection A perfectly engineered hemisphere – one half of a nearly spherical resonator used to measure the Boltzmann constant. (Courtesy: Michael de Podesta/NPL)
Accurate measurement of temperature is a key part of almost every science experiment, and in most ca

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Michael de Podesta is a physicist at the National Physical Laboratory, UK
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