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ideal gas law constant
(R) a term used in the ideal gas law which has the value: 8.3145 L kPa/mol K or 0.08206 L atm/mol K
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  April 13 in chemistry
  1784 - Torbern Bergman confirmed Müller von Reichenstein's finding that the substance isolated from a bismuth ore was a new element, tellurium (Te, element 52).
  1941 - Michael S. Brown born: cholesterol metabolism and its regulation; Nobel Prize (medicine), 1985.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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