In Poiseuille's method for the determination | vedclass

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(D) Poiseuille's equation for the coefficient of viscosity $\eta$ is given by $\eta = \frac{\pi P r^4}{8 V l}$,where $P$ is the pressure difference,$r

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Inner radius of the capillary tube

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(D) Poiseuille's equation for the coefficient of viscosity $\eta$ is given by $\eta = \frac{\pi P r^4}{8 V l}$,where $P$ is the pressure difference,$r$ is the inner radius of the capillary tube,$V$ is the volume of liquid collected per unit time,and $l$ is the length of the tube.From the formula,we see that $\eta \propto r^4$.Since the radius $r$ is raised to the power of $4$,any small error in the measurement of $r$ will lead to a very large error in the calculated value of the coefficient of viscosity $\eta$.Therefore,the inner radius of the capillary tube requires the greatest accuracy in measurement.

In Poiseuille's method for the determination of the coefficient of viscosity,the physical quantity that requires the greatest accuracy in measurement is:

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