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Abstract
The thermophoresis rate of large aerosol particles has previously been described. In this work using both hydro-dynamic and thermodynamic methods, we have calculated Kn = γ/R « 1, where γ is the gas molecule's mean free path length and R is the particle radius. The use of these two independent methods permitted us to check calculation procedures in each case and to understand the physical picture of the process better, especially when considering the thermophoresis of bodies with a large heat capacity.