Question

Which of the following is a unit of kinematic viscosity?

(a) Stokes

(b) Pa-s

(c) m2=s

(d) Poise

I have been asked this question during a job interview.

The query is from Viscosity in portion Properties of Fluids of Fluid Mechanics

Answer 1

Correct answer is (a) Stokes

For explanation: ν = μ/ρ, where ν = kinematic viscosity, μ = dynamic viscosity and ρ = density of the fluid. Unit of μ is dyne-s/cm^2 and that of ρ is kg/cm^3.

Thus, the unit of ν is cm^2/s = Stokes Poise is the unit of dynamic viscosity.

1 Poise = 1 dyne-s/cm^2