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Kilogram to be redefined soon?

Platinum-iridium definition of the kilogram. U...Image via WikipediaLondon, Oct 20 (ANI): A kilogram is officially defined as the mass of a 122-year-old cylinder of platinum and iridium, kept at the International Bureau of Weights and Measures (BIPM) in Paris. However, the cylinder's mass seems to be changing as it ages, prompting several groups of scientists to seek a replacement.

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

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