# Stokes Law and Particle Sedimentation

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Stokes' Law describes partial sedimentation. Use an air viscosity of 1.36E-4 g cm^-1 s^-1 and gravitational acceleration of g = 9.81 m s^-2.

a. Calculate the weight of one cubic centimeter of air at 1.0 atm and 15 degrees celsius.

b. Assume particles have a density of 2.40 g cm^-3 and are being released by a 100 m smokestack. How long does it take a particle to settle to the ground?

c. It rains exactly once a week. What is the smallest particle size that can settle to the grounds before wet removal?

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