 Kilogram

Unit of mass.

Defined in the 2019 redefinition of the SI base units via the Planck constant. This was possible due to the development of the Kibble balance.

A kilogram (kg) is a unit of mass in the International System of Units (SI). It is defined as being equal to the mass of the International Prototype of the Kilogram, a platinum-iridium cylinder that was kept at the International Bureau of Weights and Measures (BIPM) in France.