The most is that of the kilogram. This unit of measurement of mass will cease to be a physical object to become a value derived from a constant of nature . In this case, Planck's constant (a value that establishes the packets of energy emitted in the form of radiation). It will be measured from the Watt scale (also called Kibble or power). It is a kind of scale to use, that is, scales, but the object to be weighed is not balanced with another mass, but with an electromagnetic power.
The power must be calculated from the value of the electric current applied to generate it and the value of Planck's constant. When it reaches an equilibrium with the weight pan, it allows calibrating mass standards with the lowest margin of error achieved to date (20 micrograms per kilo). The other magnitudes that will also mobile number list be changed to become derived from a constant of nature will be the mole, the kelvin and the ampere. The mole will be obtained from Avogadro's constant , the kelvin from Boltzmann's constant and the ampere as a function of elementary charge.
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