So the new mass unit and SI units generally are finally fit for the 21st century, and will remain so long into the future. As Schlamminger aptly concludes: “The new SI is a construction of beauty and ...

Since 1889, the SI unit of mass, the kilogram, has been defined as being equal to the mass of the international prototype kilogram (IPK).

The newly ratified plan is part of a broader effort to define all seven basic units of the International System of Units (SI) — the modern version of the metric system that arose in 18th Century ...

Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Vol. 369, No. 1953, The new SI based on fundamental constants (28 October 2011), pp. 3936-3953 (18 pages) Since 1889, the ...

New definitions Today’s decision means that all seven SI units will now be defined in terms of physical constants. The biggest change will be to the kilogram, which is currently set by a 143-year-old ...

Learn about the Difference Between Pound and Kilogram. Mass is a property of matter which is not dependent on the temperature of the object in space. The SI unit of mass is kilogram (kg).

The redefinition of several physical base units planned for 2018 requires precise knowledge of the values of certain fundamental physical constants. Scientists are working hard to meet the ...

For the first time in more than 30 years, new terms have been officially added to the International System of Units (SI). The four new prefixes – ronna, quetta, ronto and quecto – describe ...

The kilogram has the dubious distinction of being the only SI unit still based on a physical object; specifically, a metal cylinder kept in a vault in France. Plans are well underway to redefine ...

A nanogram (ng) is a unit of mass in the metric system, equal to one billionth (10 -9) of a gram (g). The gram is a base unit of mass in the International System of Units (SI), making the nanogram a ...