Abstract
I FEEL that Schiller may be under some misapprehension regarding our previous work. The differential equation, the solution of which forms my complete equation for the hydration of calcium sulphate hemihydrate, was derived from one developed earlier to account for the self-acceleration of the reaction1–6 by the inclusion of a term allowing for processes leading to the decay of the rate. Contrary to Schiller's statement (preceding communication), I have not modified my views, but have expressed them more completely in mathematical terms. The differential equation resembles one quoted by Schiller7 but not derived precisely from a model. The equation mentioned by Schiller is well known for dealing with the formation and growth of nuclei of a solid product (for example, see ref. 8), and he has not tested to what extent a solution describes experimental observations in the particular system. The differences between the two equations are highly significant.
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RIDGE, M. Hydration of Calcium Sulphate Hemihydrate. Nature 205, 1209 (1965). https://doi.org/10.1038/2051209a0
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DOI: https://doi.org/10.1038/2051209a0
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