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Elusive nuclear-clock transition spotted in thorium-229 - physicsworld.com

Elusive nuclear-clock transition spotted in thorium-229 - physicsworld.com | Standards | Scoop.it
Discovery could lead to much more precise frequency standards
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Timeline : 60 years of the Atomic Clock : History : About NPL : National Physical Laboratory

Timeline : 60 years of the Atomic Clock : History : About NPL : National Physical Laboratory | Standards | Scoop.it
Stephen H. Ashworth's insight:

Leap second added in 1972.

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History of the metre - Wikipedia, the free encyclopedia

History of the metre

In the aftermath of the French Revolution (1789), the old units of measure that were associated with the ancien régime were replaced by new units. The livre was replaced by the decimal franc, and a new unit of length was introduced which became known as the metre.

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NPL named birthplace of atomic timekeeping : News : News + Events : National Physical Laboratory

NPL named birthplace of atomic timekeeping : News : News + Events : National Physical Laboratory | Standards | Scoop.it
The European Physical Society (EPS) names NPL the birthplace of atomic timekeeping.
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Distance : Measurement in Sport : Schools Posters : Educate + Explore : National Physical Laboratory

Measurement in Sport: How do we know a metre rod is really a metre long?
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Veritasium - YouTube

Veritasium - YouTube | Standards | Scoop.it
An element of truth - Science videos and now Snatoms! The magnetic molecular modelling kit: http://igg.me/at/snatoms Contact:veritasium -(at)- gmail .(dot). com
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Optical frequency metrology : Article : Nature

Optical frequency metrology : Article : Nature | Standards | Scoop.it
Nature is the international weekly journal of science: a magazine style journal that publishes full-length research papers in all disciplines of science, as well as News and Views, reviews, news, features, commentaries, web focuses and more, covering all branches of science and how science impacts upon all aspects of society and life.
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The NIST Reference on Constants, Units, and Uncertainty

The NIST Reference on Constants, Units, and Uncertainty | Standards | Scoop.it
Official NIST reference providing
essential information and background information. Includes: Values of the
fundamental physical constants and related information, Searchable
bibliography on the constants, In-depth information on the SI, the modern
metric system, and Guidelines for the expression of uncertainty in
measurement.
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National Physical Laboratory

National Physical Laboratory | Standards | Scoop.it
The National Physical Laboratory (NPL) is the UK's National Measurement Institute and is a world-leading centre of excellence in developing and applying the most accurate measurement standards, science and technology.
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