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phase change
a change in the physical state of a substance
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  February 27 in chemistry
  1793 - Carl Friedrich Wenzel died (birth date unknown c. 1740): stoichiometry; concentration determines the speed of chemical reactions.
  1869 - Alice Hamilton born: industrial toxicology; hazards of carbon monoxide, mercury, tetraethyllead, benzene, and others; first woman professor at Harvard.
  1932 - James Chadwick's note announcing the possible discovery of the neutron is published in Nature.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com

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