Certainly, here are the dielectric constants (relative permittivity) of some common materials used as dielectrics in capacitors:
Vacuum: Dielectric constant = 1 (By definition, the dielectric constant of a vacuum is considered to be 1.)
Air: Dielectric constant ≈ 1.0006 (Air's dielectric constant is very close to that of a vacuum.)
Paper: Dielectric constant ≈ 3.5 - 6.0
Mica: Dielectric constant ≈ 5.0 - 8.7
Glass: Dielectric constant ≈ 4.5 - 10.0 (varies with type)
Ceramic: Dielectric constant varies widely depending on the composition, ranging from about 5 to over 1000.
Polyethylene: Dielectric constant ≈ 2.25 - 2.35
Polypropylene: Dielectric constant ≈ 1.7 - 2.3
Polystyrene: Dielectric constant ≈ 2.4 - 2.7
Teflon (PTFE): Dielectric constant ≈ 2.1 - 2.3
Silicon Dioxide (SiO2): Dielectric constant ≈ 3.9
Barium Titanate: Dielectric constant ≈ 1200
Polyester (Mylar): Dielectric constant ≈ 3.0
Aluminum Oxide (Al2O3): Dielectric constant ≈ 9 - 11
Please note that these values are approximate and can vary depending on factors such as temperature, frequency, and the specific composition of the material. Dielectric constant is a measure of how well a material can store electrical energy in an electric field compared to a vacuum. Materials with higher dielectric constants are often used to increase the capacitance of capacitors, which store electrical charge.