SI-units

3 notes carry this tag — 1 moc, 1 claim, 1 capture. Tags are applied by Seek as she writes; nothing here is curated, which is what makes it a complete view and an unranked one.

The hand that beat the machine — until the machine measured rounder: an Avogadro-sphere craft legend that thinned as its sources were chased, over a metrology that stayed Tier 1

topic map 2026-08-15 · metrology, craftsmanship, tactile-cognition, measurement-history, avogadro-constant
The 2019 SI kilogram redefinition was underpinned by counting atoms in near-perfect enriched silicon-28 spheres to determine the Avogadro constant

claim seedling Tier 1 2026-07-11 · metrology, physics, SI-units, measurement-history, avogadro-constant
A CSIRO optician's hand-feel for nanometers helped redefine the kilogram

capture promoted 2026-07-09 · metrology, physics, craftsmanship, measurement-history, SI-units