| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| permittivity of free space number | 0.38 | 0.7 | 7689 | 7 | 33 |
| permittivity | 1 | 0.3 | 9410 | 61 | 12 |
| of | 1.81 | 0.3 | 1071 | 78 | 2 |
| free | 1.21 | 0.9 | 4855 | 49 | 4 |
| space | 0.54 | 1 | 3178 | 88 | 5 |
| number | 0.17 | 0.1 | 8130 | 79 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| permittivity of free space number | 1.66 | 0.3 | 1535 | 12 |
