以下是关于 permittivity 的详细百科式说明：

permittivity

音标
英式：/pəˌmɪtɪˈvɪti/
美式：/pɚˌmɪtɪˈvɪti/

词性
名词

中文翻译
电容率，介电常数

定义
permittivity 是物理学中描述材料允许电场通过其内部的能力的物理量。它反映了材料在电场作用下储存电能的能力。在电学和电磁学中，permittivity 是一个重要参数，通常用希腊字母 ε 表示。

基本公式
在真空中的介电常数为 ε0（真空介电常数），在某种材料中的介电常数为 ε，则通常有：
D = ε E
其中 D 为电位移矢量，E 为电场强度。

单位
国际单位制（SI）中，permittivity 的单位为法拉每米（F/m，Farad per meter）。

用法与搭配

relative permittivity 相对介电常数

absolute permittivity 绝对介电常数

permittivity tensor 介电张量

dielectric permittivity 介电常数

frequency-dependent permittivity 频率相关的介电常数

例句

The permittivity of free space is approximately 8.854 × 10^-12 F/m.

Materials with high permittivity are used in capacitors to store more electric charge.

The relative permittivity of water is much higher than that of air.

Permittivity affects the propagation speed of electromagnetic waves in a medium.

Engineers measure permittivity to design better insulating materials.

The permittivity of a dielectric depends on temperature and frequency.

The device was tested for its permittivity across a range of voltages.

High-frequency signals are influenced by the permittivity of the surrounding medium.

Changes in permittivity can indicate structural changes in a material.

Understanding permittivity is essential in the design of microwave circuits.

如果你需要，我可以再整理一份 permittivity 的中文例句翻译版本，方便更好理解。你希望我整理吗？