Electrical data
Free electron concentration
| Free electron concentration |
|
| Copper |
8.5x1028 m-3 |
| Lithium |
4.7x1028 m-3 |
| Sodium |
2.7x1028 m-3 |
| Silver |
5.9x1028 m-3 |
Resistivity
| Resistivity |
|
| Constantan |
47x10-8 Wm |
| Copper |
1.69x10-8 Wm |
| Germanium |
0.65 Wm |
| Nichrome |
130x10-8 Wm |
| Silver |
1.6x10-8 Wm |
| Silicon |
2.3x10-8 Wm |
Temperature coefficient of resistance of copper 43x10
4K
-1
Relative permeability
| Material |
Relative permeability |
| Mild steel |
2000 |
| Silicon-iron (4.25% Si) |
9000 |
| Supermalloy (16% Fe, 79% Ni, 5% Mo) |
1 000 000 |
Relative permittivities (at 293 K)
| Solid |
|
|
Liquid |
|
|
Gas |
|
| Amber |
2.8 |
|
Caster oil |
4.5 |
|
Air |
1.000 0536 |
| Ebonite |
2.8 |
|
Glycerol |
43 |
|
Carbon dioxide |
1.000 986 |
| Glass |
5-10 |
|
Ethoxyethane |
4.3 |
|
Helium |
1.000 07 |
| Mica |
5.7-6.7 |
|
Nitrobenzene |
35.7 |
|
Hydrogen |
1.000 27 |
| PVC |
4.5 |
|
Paraffin |
2.2 |
|
Nitrogen |
1.000 580 |
| Polystyrene |
2.55 |
|
Propanone |
21.3 |
|
Oxygen |
1.000 53 |
| Teflon |
2.1 |
|
Turpentine |
2.23 |
|
Water vapour (393 K) |
1.000 60 |
| Wax |
2-2.3 |
|
Water |
80.4 |
|
|
|
