| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| rydberg constant for hydrogen | 1.39 | 0.1 | 5111 | 33 | 29 |
| rydberg | 1.34 | 1 | 7474 | 70 | 7 |
| constant | 1.37 | 0.5 | 861 | 78 | 8 |
| for | 0.41 | 0.8 | 8271 | 78 | 3 |
| hydrogen | 0.9 | 0.8 | 8510 | 86 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| rydberg constant for hydrogen | 0.81 | 0.9 | 3460 | 23 |
