Now, scientists hope to define the kilogram by referring to a physical constant rather than an antique object.
Peter Becker of the Federal Institute of Physical and Technical Affairs (PTB) in Braunschweig, Germany, and his team measured the number of atoms in a sphere of silicon-28 to calculate Avogadro's constant to nine significant figures, reports Nature.
The constant refers to...... http://news.oneindia.in/2010/10/20/kilogramto-be-redefinedsoon.html