The SI system is the basis for all measurements and guarantees the same measurements for us and elsewhere. A new definition is now set for kilograms.
SI unit of mass: kilogram
- The definition of kilogram is no longer tied to the mass of the prototype, which ensures that the mass scale remains constant in the future.
- An agreed value for Planck’s standard ensures that the kilogram value does not change with the transition to the new SI system.
- The definition of a kilogram can be implemented independently, anywhere and by any suitable method.
Former definition |
New definition |
| Kilogram is a unit of mass; it is equal to the mass of the international kilogram prototype. | Kilogram, kg, is a unit of mass. Its magnitude is determined by plotting the Planck constant, h, at exactly 6,626,070 15 × 10−34 for J s, or kg m2 s − 1. |