How We're Redefining the kg
Veritasium · 3 则 HN 推荐
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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.
HN 推荐的原因： Praised as an excellent, accessible account of why the kilogram's definition changed, in redefinition threads.
“I found the Veritasium video to be a bit more interesting for the "why" aspect of this change” 阅读 HN 讨论 ↗