Abstract

The reference for (relative) measurements of the viscosity of liquids is the viscosity of bi-distilled water at 20 °C. Applying the so-called step-up method to calibrate a series of capillary viscometers can result in deviations of roughly 0,2 % in the first liquid, normally an oil, that is used after the distilled water. This error is mainly caused by the difference in surface tension between water and oil. This report shows that with a special Ostwald-type viscometer, this deviation can be reduced significantly.

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