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Mass is a quantity that . In addition to other scientific units, the kilogram also is now defined by a natural constant. This is made possible by single crystals grown from . For nearly 1years, scientists have used a singular small, metal cylinder to define the exact weight of a kilogram. Now, officials at the . The National Institute of Standards and Technology (NIST) is the official custodian of the Kilogram Prototype, a 128-year-old glistening platinum iridium cylinder . The SI unit of mass is the kilogram (kg). Before 188 the kilogram had been defined as the mass of a litre of water at °C. The first General Conference on . The atoms in a sphere of silicon-were counted to fix the Avogadro constant and redefine the mole.

A copy of Le Grand K, the kilogram. The end is nigh for the kilogram as we know it, or at least how metrologists – scientists who measure things for a living – know it. The liter bottle of soda in your refrigerator weighed about one kilogram when it was full.

Define kilogram (noun) and get synonyms. What is kilogram (noun)?