Which material typically has a high dielectric constant?

The material that typically has a high dielectric constant is glass.

Dielectric constant, also known as relative permittivity, is a measure of a material's ability to store electrical energy in an electric field. Materials with a high dielectric constant are effective insulators and are often used in capacitors and other electrical components where insulation is required.

Glass is known for its high dielectric constant because of its molecular structure, which allows it to polarize in response to an electric field. This polarization enhances the material's ability to store charge, making it a preferred choice in various electronic applications.

In contrast, air has a low dielectric constant, making it less effective as an insulator. Metals like copper and iron, while excellent conductors of electricity, do not serve as insulators and thus have low dielectric constants as well. This differentiates glass as the favorable option for applications where a high dielectric constant is needed.