The SI unit of coefficient of viscosity is
- A. N s per m squared
- B. N per m squared
- C. N m
- D. m squared per s
Explanation
Viscosity is defined through the relation between shear stress and velocity gradient, giving units of newton second per square metre, equivalently the pascal second. The pascal, newton per square metre, is pressure rather than viscosity. In the older CGS system the unit was the poise, and one pascal second equals ten poise.