# How does the viscosity (besides density) of a fluid affects sinking

If water, air of whatever fluid had a different viscosity, but the same density, would things fall/sink differently?

• [Related Quora Would-a-hydrophobic-coating-make-a-heavy-object-sink-through-water-faster] (quora.com/Science/…) – user28737 Jun 4 '14 at 6:07

$$\frac{2(\rho_s -\rho_f)}{9\mu}gR^2$$
where $\rho_s$ and $\rho_f$ are the densities of the sphere, $\mu$ is the dynamic viscosity, $g$ is the acceleration due to gravity, and $R$ is the radius of the sphere.