Kinematic viscosity is equal to A. $$\frac{{{\text{Dynamic viscosity}}}}{{{\text{Density}}}}$$ B. $${\text{Dynamic viscosity}} \times {\text{Density}}$$ C. $$\frac{{{\text{Density}}}}{{{\text{Dynamic viscosity}}}}$$ D. $$\frac{1}{{{\text{Dynamic viscosity}} \times {\text{Density}}}}$$

The correct answer is $\frac{{{\text{Dynamic viscosity}}}}{{{\text{Density}}}}$.

Kinematic viscosity is a measure of a fluid’s resistance to flow. It is defined as the ratio of the dynamic viscosity to the density of the fluid. The dynamic viscosity is a measure of the internal friction of a fluid, while the density is a measure of the mass per unit volume of the fluid.

The kinematic viscosity is important in many engineering applications, such as the design of pumps and pipelines. It is also used in the study of fluid dynamics.

The other options are incorrect. Option B is the definition of dynamic viscosity. Option C is the reciprocal of kinematic viscosity. Option D is the product of dynamic viscosity and density.