The kilogram is the only SI unit still based on a physical object. Although experiments that could define it in terms of fundamental constants were described in the 1970s, only in the past year have teams using two completely different methods achieved results that are both precise enough, and in sufficient agreement, to topple the physical definition.


CrazyEyeJoe:

That's cool, although it makes me ponder what would happen in the event of a societal collapse. Imagine the technology necessary to derive these definitions, compared to just having a platinum brick. I'm not saying that means we shouldn't do this, I just think it's an interesting thought how advanced and impenetrable science has become. It's literally impossible to be up to date on every subject in any meaningful way. It boggles the mind.


posted by rob05c: 1192 days ago