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Dear Mailbase,

 

Dealing as we do in the business of measurement, I was interested to read about the redefinition of the SI base units. Notably the kilogram will no longer be defined by the mass of a lump of metal in Paris.

https://www.bipm.org/en/measurement-units/rev-si/

 

A consequence that falls out of this is that the molar mass constant will no longer be defined as exactly 1 g/mol. The difference is reported to be of the order of 10exp-10.

 

Something to be aware of if you are weighing out pure material to produce in-house calibrators – and also reporting results to 10 significant figures…

 

Oliver Clifford-Mobley FRCPath

Principal Clinical Scientist

Department of Clinical Biochemistry

University Hospitals Bristol NHS Foundation Trust

T: 0117 342 7833

 



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