Abstract
A constant-level viscometer has been designed especially for solutions that make glass water repellent. The lower meniscus remains at a constant level (±0.02 mm) during the flow period. Lower and upper meniscus corrections and the drainage error are discussed. It is shown that the performance of the viscometer is at least as good as that of the suspended-level type for solutions that completely wet the glass wall, as KCl in water. For tetraethyl and tetrabutylammonium bromide solutions in water, this performance is free of the inaccuracies described in the literature. For Bu4NBr the relative viscosities measured at twelve concentrations in the range 10−4 to 160×10−4 M at 25°C, show a standard deviation of 0.01% about the best fit to the extended Jones–Dole equation. From these data the corresponding A coefficient has been determined, and found to agree with the value from theory.
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