Using terminal velocity to find fluid viscosity

[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

 

[Andrew Mason]

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?

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