Applying the principle of homogeneity of dimensions, check the dimensional accuracy of the relation $V = \large\frac{\pi pr^4}{8 \eta l}$ . Here V is the volume of liquid flowing out of a capillary tube per unit time, $\eta$ is the coefficient of viscosity of the liquid, p is the pressure difference across the two ends of the capillary tube, r is the radius of the capillary tube and l is the length of the capillary tube.

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