Abstract
The possibility or even necessity of revising definitions of some of the
base units of the present SI has been discussed over the past 15 years.
The last General Conference of Weights and Measures (2007) recommended to
redefine the kilogram, the ampere, the kelvin, and the mole using fixed
values of the fundamental constants by the time of the next General
Conference in 2011. This paper is a review of proposals of new definitions
of units of mentioned quantities and arguments voting for particular
variants of definitions. Most relevant papers for this review have been
published by Metrologia, the international journal appointed at the BIPM,
and many other useful pieces of information are available on www pages of
the BIPM. The author notes that not only new definitions have been
discussed but as well as the set of the base units of the SI. It means a
replacement of the ampere by the volt or the kelvin by the joule.
Decisions concerning new definitions are not made and the discussions are
still open.
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