| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| permittivity of free space in f | 1.98 | 0.5 | 8143 | 13 | 31 |
| permittivity | 0.88 | 0.6 | 9617 | 67 | 12 |
| of | 1.62 | 0.7 | 4780 | 86 | 2 |
| free | 0.3 | 0.7 | 8696 | 85 | 4 |
| space | 1.87 | 0.1 | 1472 | 6 | 5 |
| in | 1.05 | 0.8 | 4398 | 21 | 2 |
| f | 1.58 | 0.5 | 6311 | 45 | 1 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| permittivity of free space in f | 1.36 | 1 | 924 | 86 |
