The third of a three-part series based on the author's keynote lectures for the 1995 NEACT conference, this lecture argues that modern chemistry has undergone, not one, but three distinct conceptual revolutions, corresponding to the molar, molecular, and electrical levels of discourse outlined in Lecture I of the series. The author also argues that these three key turning points in chemistry illustrate three different kinds of scientific revolution, and thus provide the historian and philosopher of science with a much richer selection of examples than the traditional account of scientific change based solely on the history of theoretical physics.
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