Assignment:
Stokes' Law describing partial sedimentation is given by:
Rate = [(gd^2)(ΔΡ)]/18η
where g = 9.81 m s^-2 is gravitational acceleration. ΔΡ is the density difference between particles and the air, air viscosity of η = 1.67E-4 g cm^-1 s^-1 and d is the particle diameter in centimeters.
a. Calculate the weight(g) of one cubic centimeter of air at 1.0 atm and 15 degrees celsius.
b. Assume particles have a density of 2.45 g cm^-3 and are being released by a 100 m smokestack. How long does it take (s) a 25μm particle to settle to the ground?
c. It rains exactly once a week. What is the smallest particle size (μm) that can settle to the grounds before wet removal?
Provide complete and step by step solution for the question and show calculations and use formulas.