Issue Date: May 30, 2011
Redefining The Kilogram And Mole
Because of the possible mass change of the international prototype kilogram—the last of the International System of Units (SI) base units still defined by a physical artifact—the metrology community proposed a redefinition of the kilogram. This proposal led to a recommendation to redefine other SI base units, including the kelvin, ampere, and mole. Definitions of the second, meter (or metre), and candela will remain unchanged, although they will be worded differently. The new “fixed constant” . . .
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