Kilogram has a weight problem

From: The Scotsman | Date: May 28, 2003| Author: | Copyright information

IN THESE girth-conscious times, even weight itself has a weight problem. The kilogram is getting lighter, scientists say, and it is sowing potential confusion over a range of scientific endeavours.

The kilogram is defined by a platinum-iridium cylinder, cast in England in 1889 and kept in a sealed vault at a chateau overlooking the Seine near Paris ever since. But over

the past century, it has become lighter because of microscopic surface contamination and abrasion. It may only be the difference in weight of a grain of salt but it is enough to distort sensitive scientific calculations, and ...

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