Abstract
When calibratingU-tube capillary viscometers a kinetic energy correction is required for liquids in a certain viscosity range and in the past an unsatisfactory method has been used for its determination. This correction may be obtained with reasonable accuracy by least squares fitting flow time data to the corrected Poiseuille's law. The flow times of toluene (20°C and 25°C), benzene (25°C) and water (25°C), together with literature values of viscosity were used to determine the calibration constantC and the kinetic energy correctionB of a sizeA U-tube viscometer. The agreement with the manufacturer'sC and previously reportedB is very good. A modified kinetic energy correction of Cannon et al. does not appear to give better accuracy.
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