Explore BrainMass
Share

Explore BrainMass

    Stoke's Law air density calculation

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    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?

    © BrainMass Inc. brainmass.com October 9, 2019, 4:32 pm ad1c9bdddf
    https://brainmass.com/chemistry/environmental-chemistry/stoke-s-law-air-density-calculation-35181

    Solution Preview

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

    if we use the equation alluded to in: http://hypertextbook.com/facts/2000/RachelChu.shtml (Center choice) as "The density of moist air may be determined by a similar relation:
    D = 1.2929 (273.13/T) [(B - 0.3783e)/760] where T is the absolute temperature; B, the barometric pressure in mm, and e the vapor pressure of the moisture in the air in mm."

    Then in our circumstance D = ...

    Solution Summary

    Solution to problem involving sedimentation/settling rates of airborne particles as per Stoke's Law.

    $2.19