Fluids, both ionic and nonionic, over wide ranges of temperature and composition

While I shall give primary attention to recent research, some historical remarks seem appropriate-especially since some will concern Dr Rossini. It was in 1935 that I started my PhD thesis research with Wendell Latimer at the University of California at Berkeley. Initially, it concerned the entropies of aqueous ions, and several papers were published in that area. Before long, the opportunity arose to collaborate with J. D. Kemp on the problem of restricted internal rotation in ethane and the determination of the barrier from the entropy and other thermodynamic data. Kemp provided the entropy value; I provided the quantum statistical mechanics. Soon thereafter, I proceeded from the ethane problem to those for several other light hydrocarbons. Next came the development of statistical thermodynamic methods for the prediction of entropies, heat capacities, and related properties for various series of hydrocarbons with experimental input required for only one or two initial members. These last capabilities caught the attention of Dr Rossini, and he asked me to cooperate or collaborate in assembling tables of thermodynamic properties for various hydrocarbons. His group measured energies of combustion and obtained thereby the enthalpies of formation while I provided heat capacities, entropies, and “free-energy functions”. This information made