The value of viscosity of a fluid represents a measure of how easily the given
fluid can flow. The higher the viscosity value is, the more resistance the
fluid offers to flow. For example, it would require less energy to transport
water in a pipe than it would to transport motor oil or glycerin. The
viscosity of many fluids is governed by Newton's law of viscosity \(\tau=\mu
\frac{d u}{d y}\), where \(\tau\) is shear stress \(\left(\mathrm{N} /
\mathrm{m}^{2}\right), \mu\) is viscosity, and \(d u\) is change in flow speed
\((\mathrm{m} / \mathrm{s})\) over a height \(d y(\mathrm{~m})\). What is the
appropriate unit for viscosity?