The Viscosity of Liquids and Solutions

One of the most, striking properties of solutions of high molecular weight substances is their high viscosity] this has aroused interest both in research and in industry. 

In industry, the peculiar viscosity of solutions of liigh polymers has played an important role in the fashioning of films, filaments and varnished articles of every kind, and it may be said that in many cases viscosity may constitute one of the most essential criteria of quality for the solutions used industrially. For many years viscosity has been applied as an empirical but useful guide to the quality of many materials, so that a whole series of standard technical methods for its measurement have been devised.  

The remarkable phenomena of high viscosity have also aroused scientific interest and E. Berl, W. Biltz, J. Duclaux, Wo. Ostwald and O. Sackur began experimental investigations in this field over twenty years ago. The aim was not only to obtain an empirical insight into viscosity, 

In the course of this development, systematic experiments with test models by F. Eirich and his collaborators and the closely related theoretical studies of E. Guth and R. Simha, begun at the suggestion of the author, have contributed to the elucidation of the problem. The studies and calculations of M. L. Huggins and W. Kuhn have cleared up many essential points. 

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