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: Microscopic "walkers" find their way across cell surfaces

add to favorites email to friend print save as pdf

Related Stories

US state reaches deal to keep dinosaur mummy

46 minutes ago

North Dakota reached a $3 million deal to keep a rare fossil of a duckbilled dinosaur on display at the state's heritage center, where it will serve as a cornerstone for the facility's $51 million expansion, officials said ...

Apple sees iCloud attacks; China hack reported

28 minutes ago

Apple said Tuesday its iCloud server has been the target of "intermittent" attacks, hours after a security blog said Chinese authorities had been trying to hack into the system.

Recommended for you

Cooling with molecules

22 hours ago

An international team of scientists have become the first ever researchers to successfully reach temperatures below minus 272.15 degrees Celsius – only just above absolute zero – using magnetic molecules. ...

User comments : 0