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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).

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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.

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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
aphotic
  • Having no light.
  • Of or relating to the region of a body of water that is not reached by sunlight and in which photosynthesis is unable to occur.
The word 'aphotic' comes from Greek roots meaning 'without' and 'light'.
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