Abstract
THE uncertainties associated with the kinetic energy correction in conventional capillary-tube viscometry result in considerable inaccuracy and inconvenience. These uncertainties arise from the dependence of the kinetic energy ‘constant’, B, on flow-rate and on the form of the capillary ends, B being denned by the equation: 
where ν is the kinematic viscosity, t is the time of flow and C is the principal calibration constant. The significance of the kinetic energy term in the accurate measurement of the viscosity of liquids using capillary viscometers was emphasized at the recent symposium1 arranged by the Institute of Petroleum and the British Society of Rheology.
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References
Mardles, E. W. J., Nature, 182, 438 (1958).
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CAW, W., WYLIE, R. Capillary-tube Viscometry with Negligible Kinetic Energy Effects. Nature 182, 1153–1154 (1958). https://doi.org/10.1038/1821153a0
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DOI: https://doi.org/10.1038/1821153a0
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