Electric susceptibility to relative permittivity (dielectric constant)
Type a value in χe to get it in εr instantly.
5.4εr
That's 1.23× as polarizable as FR-4 circuit board, while glass is 1.11× higher. A signal in it travels at about 43.03% of the speed of light.
What it means
How strongly does it polarize?
Values are typical at low frequency and room temperature. Water’s permittivity falls sharply at microwave frequencies, which is how microwave ovens heat it.
The math
How to convert χe to εr
Absolute permittivity is ε = εr × 8.854 pF/m. For a non-magnetic material the refractive index is √εr, and a cable’s velocity factor is 1 ÷ √εr.
Example: 4.4 χe = 5.4 εr.
Every unit
Your permittivity in every unit
Tables
χe to εr conversion table
| χe | εr |
|---|---|
| 1 χe | 2 εr |
| 1.5 χe | 2.5 εr |
| 2 χe | 3 εr |
| 2.1 χe | 3.1 εr |
| 3 χe | 4 εr |
| 4 χe | 5 εr |
| 4.4 χe | 5.4 εr |
| 6 χe | 7 εr |
| 10 χe | 11 εr |
| 20 χe | 21 εr |
| 50 χe | 51 εr |
| 80 χe | 81 εr |
εr to χe conversion table
| εr | χe |
|---|---|
| 1 εr | 0 χe |
| 1.5 εr | 0.5 χe |
| 2 εr | 1 χe |
| 2.1 εr | 1.1 χe |
| 3 εr | 2 χe |
| 4 εr | 3 χe |
| 4.4 εr | 3.4 χe |
| 6 εr | 5 χe |
| 10 εr | 9 χe |
| 20 εr | 19 χe |
| 50 εr | 49 χe |
| 80 εr | 79 χe |
Quick answers
Quick answers
- How many εr is 1 χe?
- 1 χe is 2 εr.
- How many εr is 10 χe?
- 10 χe is 11 εr.
- How many εr is 4.4 χe?
- 4.4 χe is 5.4 εr.
The units
About these units
Electric susceptibility (χe)
How much the material adds on top of vacuum: εr − 1.
Relative permittivity (dielectric constant) (εr)
Compared with a vacuum, which is exactly 1.
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