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There are seven base units in the SI - System International, of which Mass is one, and the kilogram is the base unit. (Weight is mass x acceleration.)

At this moment, the unit of mass is referred to a prototype standard kilogram - a physical piece of metal.

It is intended to re-define the unit of mass in terms of the mass of some fundamental particle, and this will be related to mass by the use of Avagadros number, or Planck Constant. Possibly using an ultra-precision sphere of high purity silicon.

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