OT: Alien Media (was Disasters and Recovery)

From: Hans Franke <Hans.Franke_at_mch20.sbs.de>
Date: Fri Jan 22 13:34:30 1999

> Philip.Belben_at_pgen.com wrote:
> > Metre, Kilogram, Second, Ampere, Kelvin, Mole and Candela (normally

> Kilogram? Why not gram?

Since the base unit is the Kilogram. As Philip said,
the Mass is still defined by the artefact kilogram
in Paris - there is no other definition until now.

BTW: Tey are about to replace the 'first' Kilogram
by a new model, made from a single Silicon cristal.
Since, if the process of 'building' a prototype
Kilogram artefact can be better defined, a higher
accuracy can be reached. This is part of the
international Avogadro project to redefine the
Kilogram via a non prototype artefact method.
For example, within a cristal the number of Si
atoms can be determinated - now the kg (or g)
can be based on the Mole (via the definition of
usin Si and a fixed number).


Ich denke, also bin ich, also gut
Received on Fri Jan 22 1999 - 13:34:30 GMT

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