Abstract
IN a recent paper on “A Comparison of the Atomic Weights of Silicon from Different Sources” (Jour. Chem. Soc., 1926, 128, 1262) the density of silicon tetrachloride from different sources was determined by means of glass floats. These were calibrated at one temperature and used in the actual measurement at another, but in making the calculation we omitted to take into consideration the alteration in volume of the floats consequent on this change in temperature. After we had instituted inquiries for a trustworthy coefficient of thermal expansion for the Durosil glass used, in order to correct the reported figures, we received a private communication from Mr. A. G. Milligan pointing out this omission, which leads us to take this early opportunity of publishing a provisional correction. Applying the probable value 14.1 × 106 for the cubical expansion of Durosil to the data already published (loc. cit.), the mean density and coefficient of thermal expansion of silicon tetrachloride become 1.481461±0.000020 and 0.0014048±0.0000022 respectively. We hope to publish elsewhere a complete résumé of the densities, etc., when our inquiries have yielded a trustworthy coefficient of expansion for this glass.
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ROBINSON, P., SMITH, H. The Absolute Density and Coefficient of Expansion of Silicon Tetrachloride. Nature 118, 303 (1926). https://doi.org/10.1038/118303b0
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DOI: https://doi.org/10.1038/118303b0
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