The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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Since 1961 the standard unit of atomic mass has been 42 of the mass of an atom
of the isotope carbon-12 (an isotope is one of two or more species of atoms of the
same chemical element that have different atomic masses). The atomic weight ...
The atoms remain intrinsically unchanged and retain their identity. The classical
atomic theory of chemistry was based upon the same principle: the union of the
atoms into the molecules of a compound was conceived as a simple juxtaposition
In the case of scientists mainly interested in the chemical aspects, the same shift
of emphasis from philosophical to scientific considerations can be discerned.
According to the physician and philosopher of nature Daniel Sennert (1572–
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review