HackerTube / Video
How We're Redefining the kg
Veritasium
Veritasium explains why the kilogram is being redefined in terms of Planck's constant rather than a physical metal artifact. It visits NIST to show the Kibble balance and why measuring mass precisely is hard.
Praised as an excellent, accessible account of why the kilogram's definition changed, in redefinition threads.
3 Hacker News mentions · 2017–2024