Mass is one of the seven fundamental quantities in physics (the SI units). It is the property of matter that gives it inertia and weight. The unit of mass is kg.
Weight is actually the force that a mass generates due to gravity. Weight has the unit N (Newton), but in everyday life we commonly use the unit of mass: kg.
Following the revision of the SI system in 2019, the last of the base units not linked to a fundamental constant finally found its solution.
Until 20 May 2019, the definition of the kilogram was based on the mass of a physical artefact kept at the BIPM in Paris. After this date, the definition was linked to Planck’s constant, meaning that no physical objects now define any of the SI base units. However, the prototype kilograms – both the one in Paris and the Norwegian prototype – are still used as reference standards.
The National Laboratory (NL) at the Norwegian Metrology Service is responsible for performing mass calibrations. All formal traceability requirements for measurements associated with accreditation or certification are fulfilled through the use of our calibration services.
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