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*'''Path resistance''' cR<sub>d</sub> = R<sub>b</sub> + R<sub>K</sub>
*'''Contact resistance and contact force''' <math>R_K = 280D280\rho^3 \sqrt[E(F ]{F_K · r) K} </math>
(According to Holm model for film-free spherical contact surfaces with plastic
deformation of the contact material; F<sub>k</sub> < 1 N for typical contact materials)
