Читать книгу Surface Science and Adhesion in Cosmetics - Группа авторов - Страница 46

Oil polarity as relative permittivity can be measured by an LCR meter by Agilent Technologies [35]. Permittivity ε is a measure of the polarizability of a solvent (responsiveness of a localized charge distribution (dipole) to an external electric field), a property which is related to the polarity of the solvent molecules.

Permittivity is defined as the ratio D/E where D is the electric flux density and E is the electric field strength. The permittivity is specified in Farads per meter (F/m). It can also be defined as a dimensionless relative permittivity, or dielectric constant, normalized to the absolute vacuum permittivity ε₀ = 8.85419 x10^-12 F/m.