Dielectric Constants at 20°C

MaterialDielectric 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
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.

Electric and magnetic constants
Dielectric constants of semiconductors
Index

Tables

Reference
Sears, Zemansky,Young
Table 27-1
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