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Macroscopic and x‐ray volume expansivity measurements have, in recent years, yielded information about the formation energies and entropies of atomic vacancies in several crystalline solids. Such vacancy data may now be utilized in conjunction with the great amount of volume expansivity, heat capacity, and elastic constant data that has become generally available to ascertain the relative contribution of thermally‐generated vacancies to various thermodynamic properties. The present paper reports the results of an endeavor of this sort for neon, argon, krypton, aluminum, lead, copper, silver, and gold. Critical evaluation of data in the literature is required. It is shown, for the solids investigated, that among the ordinary thermodynamic properties, the one most sensitive to the presence of thermal vacancies is the coefficient of thermal expansion. Heuristic justification is thus obtained for the use of thermal expansion methods (in preference to other methods) for determining the properties of this type of thermal defect. Comparisons are also made with published analyses by other authors.

This paper discusses recent experiments related to e+e− ⇒ hadrons. Subjects discussed include hadron form factors, the total hadronic cross section, multiplicities and some specific channels.