Abstract
Faraday Society, March 1.—Dr. T. Martin Lowry and F. C. Hemmings: The properties of powders. The caking of salts is, in general, dependent on the presence of a solvent, usually water. The following cases have been studied: Nitrates, other anhydrous compounds, hydrated salts, loss of sulphur dioxide during caking, and contraction during caking of copper sulphate.—Dr. T. Martin Lowry and S. Wilding: The setting of dental cements. Phenomena of caking or setting may be divided into five classes:—(1) Recrystallisation of anhydrous or hydrated salt without change of chemical composition. (2) Formation of hydrates. (3) The hydrolysis of complex salts by water. (4) The formation of new salts, such as the magnesium oxy-cements and the zinc oxy-phosphate cements used in dentistry, and “silicate” cements. (5) Amalgams in which mercury takes the place of water.
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Societies and Academies. Nature 105, 217–219 (1920). https://doi.org/10.1038/105217c0
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DOI: https://doi.org/10.1038/105217c0