#205 Standard for 1 kilogram (kg)

The standard for 1 kilogram (kg) used to be based on a physical object known as the International Prototype of the Kilogram (IPK), which was a platinum-iridium cylinder kept at the International Bureau of Weights and Measures (BIPM) in France. This cylinder, often referred to as "Le Grand K," served as the primary reference for the kilogram and was used as the standard for defining the unit of mass.
However, in May 2019, the definition of the kilogram was redefined in terms of fundamental constants of nature. The kilogram is now defined using the Planck constant (h), which is a fundamental constant of nature, along with other constants like the speed of light (c) and the cesium frequency (ΔνCs). This definition, known as the "revised SI" (Systeme International d'Unites), provides a more stable and precise definition of the kilogram.
So, as of May 20, 2019, 1 kilogram is defined as:
"The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015 × 10^(-34) joule-second (J·s), with the meter and the second being defined in terms of c and ΔνCs."
This redefinition ensures that the kilogram is no longer dependent on a physical object and provides a more accurate and consistent basis for measurement.

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