The best replacement for dielectric constant is conductivity.


The best alternatives to dielectric constant are rated as following:
★★★★★  conductivity
★★★★  dielectric strength
★★★  dipole moment
★★★  permittivity
★★  relative permittivity
★  refractive index

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Speaking about dielectric constant, one probably shouldn't forget about capacitance.

Other search terms related to dielectric constant and their ratings are:

★★★★★ capacitance
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dielectric constant
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