A slip correction factor is used to correct Stokes' law for the fact that the no-slip boundary condition is violated for small aerosol particles moving with respect to the gaseous medium. The Knudsen-Weber form of the slip correction is given by C(Kn) In this study an improved version of the Millikan apparatus was designed, built, and used to measure the slip correction factors for 90 solid, spherical particles in air. Measurements were made on 11 polystyrene latexdivinylbenzene particles, 25 polyvinyltoluene particles, and 54 polystyrene latex particles, spanning a Knudsen number range from 0.03 to 7.2. The fitted nonlinear least squares values of a, $, and y are 1.142 (+0.0024 SE), 0.558 (+ 0.0024 SE), and 0.999 (k 0.0212 SE), respectively, for the assumed mean free path of 0.0673 pm for air at sea level and 23°C with viscosity of 183.245 micropoise. This value of a agrees very closely with Millikan's result (adjusted to the same mean free path).

No abstract

No abstract

No abstract

No abstract