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Frontpage / News / The new SI will be launched on World Metrology Day on 20th of May, 2019

The new SI will be launched on World Metrology Day on 20th of May, 2019

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.

Learn more about SI reform

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.

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© All rights reserved

 

Lahti Precision
P.O. Box 22
Mestarinkatu 2
FI-15800 Lahti, Finland

tel. +358 3 82921
general@lahtiprecision.com

Lahti Precision Oy 2020
© All rights reserved

 

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