Densities of spherical molecules and their mixtures
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"The volume change on mixing, or, excess volume, observed when two pure liquids of different molecular species are mixed is correlated to the dissimilarities in molecular properties including intermolecular forces, shape, size, and polarity. It would then follow that any theory designed to interpret or evaluate the molecular properties of liquids must be able to predict the volume changes on mixing. Existing theories have been shown to effectively predict the properties of mixtures of spherical, nonpolar molecules of equal size, and it would logically follow that the study of liquid systems comprised of spherical nonpolar molecules significantly different in size would be of high priority. One such liquid system is highly suitable for this work, that of carbon tetrachloride (CC14) and octamethylcyclotetrasiloxane (OMCTS). The only two investigations (30, 33) conducted employing this particular liquid system produced inconsistent results--results so inconsistent as to totally obscure their use in any quantitative tests of the theories. The intent of this investigation was to gather high accuracy density data with three distinct purposes in mind. The first of these was the resolution of the differences in values for experimental excess volumes available in existing literature. Secondly, these data in the form of excess volumes were utilized in testing various theories of the liquid state, as well as in providing the support for suggested improvements of these same theories. Thirdly, these measurements are an integral portion of a concurrent study at this laboratory, which will result in high accuracy pressure-volume-temperature-mole fraction data that will be beneficial in the examination of the present liquid theories. Coincidental with the aforementioned purposes was the generation of density data beyond the temperature range of any already in existence."--Page 1.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.