When a sphere of \(0.25 \mathrm{~mm}\) diameter and specific gravity 5.54 is dropped in water at \(25^{\circ} \mathrm{C}\) it will attain a constant velocity of \(0.07 \mathrm{~m} / \mathrm{s}\). What specific gravity must a \(2.5 \mathrm{~mm}\) sphere have so that when it is dropped in crude oil at \(25^{\circ} \mathrm{C}\) the two flows will be dynamically similar when the terminal velocity is attained?