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ELECTRICAL, MAGNETIC & OPTICAL PROPERTIES

Permittivity, e  

Dielectric constant - relative permittivity Ke = e / e o

 

Permittivity of free space e o = 8.854 187 8 x 10-12 C2.N-1.m-2

 

 Substance

Permittivity

e (C2.N-1.m-2)x10-12

Dielectric constant

Ke = e / e o

Vacuum

8.85

1.000 00

Air

8.85

1.000 54

Body tissue

71

8

Glass

40-90

5-10

Mica

25-55

3-6

Nylon

31

3.5

Paper

18-35

2-4

Polyethylene

20

2.3

Polystyrene

23

2.6

Rubber

18-27

2-3

Silicone oil

19-25

2.2-2.8

Sodium chloride

50

5.6

Teflon

19

2.1

Ethanol (25 C)

220

24.3

Methanol (20 C)

300

33.6

Water (20 C)

710

80

 

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