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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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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 »
Concentration expressions and notations Last Updated on 2012-01-27 at 17:17 In chemistry and other sciences, engineering and in fairly common usage, concentration is the measure of how much of a given substance there is in a given mixture of... More »
Molar gas constant Last Updated on 2012-01-20 at 10:03 The molar gas constant (also known as the universal or ideal gas constant and designated by the symbol R ) is an important physical constant which appears in many of the... More »
Tissue weighting factor Last Updated on 2011-12-08 at 08:38 Table 1. Tissue Weighting Factors (WT) for Individual Tissues and Organs Tissue or Organ Tissue... More »
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