Electric susceptibility

Japanese: 電気感受率 - でんきかんじゅりつ（英語表記）electric susceptibility

It is a fundamental quantity that indicates the electrical properties of a material, i.e., the degree of polarization, and is also called dielectric polarizability or simply polarizability. In SI units, it refers to the _χe in the equation relating dielectric polarization P and electric field E , P = ε ₀ χ _e E (ε ₀ is the dielectric constant of a vacuum). In isotropic materials, it is a scalar quantity, and is usually a constant when the electric field is small, but in anisotropic materials, the directions of P and E do not coincide, so it becomes a tensor quantity. It is sometimes written as P = χ _e E. The units of _χe are dimensionless in the former and F/m (F is farad), the same as ε ₀ , in the latter.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

物質の電気的性質，すなわち分極の難易の程度を示す基本的な量で，誘電分極率または単に分極率ともいう。 SI 単位で誘電分極 P と電場 E との関係式 P＝ε₀χ_eE ( ε₀ は真空の誘電率) の χ_e をさす。等方性物質ではスカラー量で，普通電場が小さいときは定数であるが，異方性物質では P と E の方向が一致しないのでテンソル量となる。 P＝χ_eE と書くこともある。 χ_e の単位は前者では無次元，後者では ε₀ と同じF/m (Fはファラド) である。

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