单词	permittivity
释义	permittivity noun per·​mit·​tiv·​i·​ty ˌpər-ˌmi-ˈti-və-tē  -mə- : the ability of a material to store electrical potential energy under the influence of an electric field measured by the ratio of the capacitance of a capacitor with the material as dielectric to its capacitance with vacuum as dielectric called also dielectric constant Example Sentences Recent Examples on the Web The fine structure constant is a combination of four other fundamental constants: the speed of light, the charge on the electron, Planck’s constant, and the permittivity of free space. Chris Lee, Ars Technica, 28 Apr. 2020 Word History Etymology permit entry 1 + -ivity (as in selectivity) First Known Use 1887, in the meaning defined above
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