ANS:C - kinematic viscosity

The dimension of diffusivity is the same as that of kinematic viscosity. Diffusivity (𝐷D) is a property that describes the rate of diffusion of a substance through a medium. It is defined as the ratio of the rate of mass transfer to the concentration gradient, and its units are typically expressed as length squared per time. In the International System of Units (SI), diffusivity is measured in square meters per second (𝑚2/𝑠m2/s). Similarly, kinematic viscosity (𝜈ν) is defined as the ratio of dynamic viscosity (𝜇μ) to density (𝜌ρ). Its units are typically expressed as length squared per time, and in the SI system, it is measured in square meters per second (𝑚2/𝑠m2/s). Therefore, the dimension of diffusivity is the same as that of kinematic viscosity, which is 𝑙𝑒𝑛𝑔𝑡ℎ2/𝑡𝑖𝑚𝑒length2/time.