| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| refractive index of air | 0.1 | 0.5 | 402 | 15 | 23 |
| refractive | 0.82 | 0.9 | 485 | 8 | 10 |
| index | 0.46 | 0.6 | 4076 | 13 | 5 |
| of | 1.34 | 0.9 | 6527 | 65 | 2 |
| air | 0.18 | 0.4 | 1255 | 96 | 3 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| refractive index of air | 0.96 | 0.5 | 8536 | 58 |
