单词	permittivity
释义	permittivity /ˌpəːmɪˈtɪvɪti / noun Physics The ability of a substance to store electrical energy in an electric field.He calculated that a material that had a negative permittivity and a negative permeability would also have a negative refractive index.... In both cases, the lowering of the local permittivity entails a free energy decrease. These interactions are screened by a dielectric permittivity of the order 10.
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