Shrinking Kilogram Bewilders Physicists

Sep 12, 2007 By JAMEY KEATEN, Associated Press Writer
Shrinking Kilogram Bewilders Physicists (AP)
Physicist Richard Davis of the International Bureau of Weights and Measures, sits next to a copy of a 118-year-old cylinder that has been the international prototype for the metric mass, in his office in Sevres, southwest of Paris, Wednesday, Sept. 12,007. Davis said the reference kilo appears to have lost 50 micrograms compared to the average of dozens of copies. The kilogram's inconstancy illustrates how technological progress is leaving science's most basic measurements in its dust. (AP Photo/Jacques Brinon)

(AP) -- A kilogram just isn't what it used to be. The 118-year-old cylinder that is the international prototype for the metric mass, kept tightly under lock and key outside Paris, is mysteriously losing weight - if ever so slightly.



Content from The Associated Press expires 15 days after original publication date. For more information about The Associated Press, please visit www.ap.org .

Explore further: Revealed: Positronium's behavior in particle billiards

Related Stories

Recommended for you

Revealed: Positronium's behavior in particle billiards

16 hours ago

Collision physics can be like a game of billiards. Yet in the microscopic world, the outcome of the game is hard to predict. Fire a particle at a group of other particles, and they may scatter, combine or ...

Extreme lab at European X-ray laser XFEL is a go

Jul 02, 2015

The Helmholtz Senate has given the green light for the Association's involvement in the Helmholtz International Beamline (HIB), a new kind of experimentation station at the X-ray laser European XFEL in Hamburg, ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.