 Clausius-Mossotti factor

The spherical-particle polarization-contrast factor $\tilde{K}=({\widetilde{ϵ}}_p-{\widetilde{ϵ}}_m)/({\widetilde{ϵ}}_p+2{\widetilde{ϵ}}_m)$. Its real part controls ordinary time-averaged dielectrophoresis in the quasistatic dipole approximation.