Thursday, 13. September 2007
Topic: NEWS english - on September 13, 2007 at 11:27:00 AM CEST
Official prototype of kilogram losing weight
A kilogram just isn't what it used to be.
A 118-year-old cylinder that has been the international prototype for the metric mass, and kept tightly under lock and key outside Paris, is mysteriously losing its weight - if ever so slightly.
Physicist Richard Davis of the International Bureau of Weights and Measures in Sevres, southwest of Paris, says the reference kilo appears to have lost 50 micrograms compared with the average of dozens of copies.
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