Quantcast

Latest SI base units Stories

2008-09-23 03:00:10

By Vayshenker, I Li, X; Livigni, D J; Lehman, J H; Bermudez, J C; Molina, J C; Ruiz, Z E We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST- USA) and Centro Nacional De Metrologia (CENAM-Mexico).

6ed60629f44cb8b9fd715d1c2ad82b4b1
2008-02-28 18:53:08

The kilogram is losing weight and many international scientists, including some at Sandia National Laboratories, agree that it’s time to redefine it.

6b6a393fe3a9962291d5b99c201176911
2007-09-12 19:35:00

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.


Word of the Day
postliminy
  • In Roman antiquity, the return of a person who had been banished, or taken prisoner by an enemy, to his old condition and former privileges.
  • In international law, that right by virtue of which persons and things taken by an enemy in war are restored to their former status when coming again under the power of the nation to which they belonged.
The word 'postliminy' comes from a Latin word meaning 'threshold'.