Does anyone know equations that can be used to equate fluid viscosity

1. Feb 20, 2005

tntcoder

Does anyone know equations that can be used to equate fluid viscosity using the terminal velocity of a mass falling down a tube of that liquid?

Thanks

2. Feb 20, 2005

Andrew Mason

Try this equation for terminal velocity of a falling sphere of radius R:

$$v_{t} = \frac{mg}{6\pi R\eta}$$

where $\eta$ is the viscosity of the fluid. This is derived from Stokes' Law.

AM