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By Michael E. Brown, Boris V. L'vov

This booklet covers the result of investigations into the mechanisms and kinetics of thermal decompositions of sturdy and liquid components at the foundation of thermochemical analyses of the strategies. within the framework of the proposed rules, the most good points of those reactions are defined and lots of difficulties and weird phenomena, that have accrued during this box are interpreted. New tools of TA size and calculation were constructed, which enable the precision and accuracy of selection of kinetic parameters to be elevated considerably. trustworthy kinetic features were received and the decomposition mechanisms for a number of tens of drugs were interpreted. those comprise various sessions of compounds: crystalline hydrates, oxides, hydroxides, nitrides, azides, nitrates, sulfates, carbonates and oxalates.

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Sample text

A theoretical analysis and comparison with the experiments conducted by Hertz led to two fundamental conclusions. First, every substance has a maximum rate of evaporation which is dependent only upon the surface temperature and the properties of the substance; and, second, the maximum rate of evaporation cannot exceed the number of molecules from the vapour phase that are incident upon the surface of the condensate when equilibrium conditions are established. The investigations of Hertz were given a new impetus only a few decades later in the studies of Knudsen [20] and Langmuir [21].

Siberian Branch Russian Academy of Science, Novosibirsk (in Russian) 3. Somorjai GA, Lester JE (1967) Evaporation mechanism of solids. In: Reiss H (ed) Progress in solid state chemistry. Pergamon, Oxford, pp 1–52 4. Knudsen M (1915) Ann. Phys (Leipzig) 47:697–700 5. Garner WE (1955) (ed) Chemistry of the solid state. Butterworths, London 6. Galwey AK, Dollimore D, Brown ME (1980) Reactions in the solid state. Elsevier, Amsterdam 7. Prodan EA, Pavlyuchenko MM, Prodan SA (1976) Regularities of topochemical reactions.

Its magnitude is assumed to be equal to, or above, the molar enthalpy of a reaction. Under some conditions, however, parameter E turns out to be smaller than the molar enthalpy [8]. Such reactions refer to multistage processes under the assumption (somewhat more than questionable, in our opinion) that their resultant rate is dominated by stages that do not depend on the molar enthalpy. 3 The Hertz–Langmuir Equation and Langmuir Diffusion Equations Vaporization in Vacuum In 1882, Heinrich Hertz, at the age of 25, published a paper [19] dealing with a study of the vaporization rate of mercury in vacuum and a comparison of the experimental data obtained with theory.

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