| Material | Dielectric Constant |
| Vacuum | 1 |
| Glass | 5-10 |
| Mica | 3-6 |
| Mylar | 3.1 |
| Neoprene | 6.70 |
| Plexiglas | 3.40 |
| Polyethylene | 2.25 |
| Polyvinyl chloride | 3.18 |
| Teflon | 2.1 |
| Germanium | 16 |
| Strontiun titanate | 310 |
| Titanium dioxide (rutile) | 173 perp
86 para |
| Water | 80.4 |
| Glycerin | 42.5 |
| Liquid ammonia(-78°C | 25 |
| Benzene | 2.284 |
| Air(1 atm) | 1.00059 |
| Air(100 atm) | 1.0548 |
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The dielectric constant k is the relative permittivity of a dielectric material. It is an important parameter in characterizing capacitors. It is unfortunate that the same symbol k is often used for Coulomb's constant, so one must be careful of this possible confusion. It is more typical of physics texts to use the form 1/4πε0 for Coulomb's constant.
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