| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| acoustic impedance of air | 1.05 | 0.6 | 4614 | 35 | 25 |
| acoustic | 1.61 | 0.5 | 2373 | 73 | 8 |
| impedance | 1.06 | 0.6 | 1492 | 21 | 9 |
| of | 0.23 | 0.5 | 247 | 3 | 2 |
| air | 0.05 | 0.8 | 7685 | 38 | 3 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| acoustic impedance of air | 1.37 | 0.4 | 8205 | 39 |
