介电常数 K
材料的介电常数（电容率） \( \varepsilon \) 与自由空间介电常数 \( \varepsilon_0 \)（8.85419 x 10-12 Coulomb/N-m2）之比。
\begin{align} \label{eq:11901a} K = \frac{\varepsilon}{\varepsilon_0} \end{align}
对于介电材料，介电常数在一定程度上决定了施加电场所能感应出的电荷量。
也称为"相对介电常数"或"相对电容率"。
参见电容率。
Dielectric constant K
The ratio of the permittivity \( \varepsilon \) of the material to the permittivity \( \varepsilon_0 \) of free space (8.85419 x 10-12 Coulomb/N-m2).
\begin{align} \label{eq:11901a} K = \frac{\varepsilon}{\varepsilon_0} \end{align}
For a dielectric material, the dielectric constant determines, in part, the charge that can be induced by an applied electric field.
Also called "relative dielectric constant" or "relative permattivity'.
See permittivity.