Someone argues: "Before 2019 the kilogram drifted against its copies by about over a…
PHYSICS · Subjective · Fermi University Physics · Scientific Practice & Experimental Methods · Quantities, units and the practice of measurement · Quantities, units and the practice of measurement
Measurement and Method, Ch What a measured value is: quantities, units and the SI
Problem
Someone argues: "Before 2019 the kilogram drifted against its copies by about 50μg over a century, which was a real problem. Fixing h in 2019 solved that problem overnight, so every laboratory balance in the world became more accurate the day the redefinition took effect." Evaluate this claim, distinguishing between what the redefinition fixed by definition and what depends on how the kilogram is actually realised on a bench.