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    • A Walk Through Time Featured Article A Walk Through Time A Walk Through Time

      The Evolution of Time Measurement through the Ages. A Walk Through Time Ancient Calendars Celestial bodies — the Sun, Moon, planets, and stars — have... More »

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Energy Last Updated on 2013-03-26 at 16:16 In physics, energy is the capacity for doing work, where work is the action of a force acting over some distance. The term derives from the Greek energeia, or activity, with... More »
Bucket temperature Last Updated on 2012-07-02 at 08:48 Bucket temperature is the surface temperature of the ocean as measured by a bucket thermometer. This can also be the temperature measured by immersing a surface thermometer... More »
Mass Last Updated on 2012-06-09 at 19:31 In physics, mass (often defined as the "quantity of matter") commonly refers to two properties of matter which describe its response (acceleration) to an applied... More »
International Union of Pure and Applied Chemistry Last Updated on 2012-04-10 at 21:33 The International Union of Pure and Applied Chemistry (IUPAC) is a non-governmental scientific organization serving to advance all aspects of the chemical sciences and to... More »
A Walk Through Time Last Updated on 2012-03-22 at 11:14 The Evolution of Time Measurement through the Ages. A Walk Through Time Ancient Calendars Celestial bodies — the Sun, Moon, planets, and stars — have... More »
National Institute of Standards and Technology Last Updated on 2012-02-09 at 17:18 The National Institute of Standards and Technology (NIST) is a United States federal agency within the U.S. Department of Commerce.[1] The institute was founded in... More »
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