The SciencesDecember 1, 2006
Weighty Matters
The century-old artifact that defines the kilogram, the fundamental unit of mass, is to be replaced by a more accurate standard based on an invariant property of nature
Stories by Ian Robinson
Weighty Matters
The century-old artifact that defines the kilogram, the fundamental unit of mass, is to be replaced by a more accurate standard based on an invariant property of nature