The capillary tube used for measuring the coefficient of viscosity of water must be uniform in cross-section , why ?
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it has been observed that the non-uniform capillary has a lower liquid transport efficiency as compared with that of the uniform capillary,
The wicking velocity of any liquid in non-uniform capillary decreases due to the increased unevenness or non uniform cross section of the capillary caused by more frequent alternations between the converging section.
That's why we can say that the capillary tube used for measuring the coefficient of viscosity of water must be uniform in cross-section.
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