2165.     MAMPEL, K. L.  [Time Versus Amount of Reaction Formulas for Heterogeneous Reactions at the Phase Boundaries of Solids.  I.  Development of the Mathematical Methods and the Derivation of Surface Area Versus Amount of Reaction Formulas.]  Ztschr. physik. Chem., vol. 187, A, 1940, pp. 43-57; Chem. Abs., vol. 35, 1941, p. 2058.

        Mathematical and theoretical.  The simplifying assumptions of other workers are eliminated.  Mampel assumes only equal rates of nuclear formation for equal times and for equal areas of unaffected surface and a constant velocity of growth of the nuclei.  The formulas apply tot he induction period as well as to the principal period of the reaction.  The equation of Fischbeck and Spingler for the induction period is derived.