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Breakthrough achievement in scientists' effort to redefine `kilogram`

A research team from Italy, Japan and Germany has made the ongoing international effort to redefine the kilogram by 2018 much easier by correlating two of the most precise measurements of Avogadro's number and obtaining one averaged value.

Most accurate definition of kilogram on anvil

Researchers have developed a novel system to allow a direct comparison of an object being weighed in a vacuum to one outside a vacuum.

It`s official! The kilogram has put on weight

The official kilogramme - a cylinder-shaped hunk of metal - that defines the fundamental unit of mass, has itself gained weight, scientists say.