Stokes Law, Viscosity. (very simple)

  • Thread starter mr-tom
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Main Question or Discussion Point

I'm trying to find the viscosity of some glycerol that we dropped various steel balls down using the equation:

V = [2r^2 (p – σ) g] / 9η

I put in these values:
p = 7800 kg m-3
σ = 1200 kg m-3
g = 9.8 m s-2

And ended up with the equation. η = 129360r^2 / 9V

My problem is that I thought viscosity is a constant. When I put my values in the viscosity decreases as radius decreases.
 

Answers and Replies

Astronuc
Staff Emeritus
Science Advisor
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Ok thanks, so i must've made a mistake somewhere...
 

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