| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| expired air contains how much oxygen | 1.65 | 0.3 | 1910 | 40 |
| how much oxygen does expired air contain | 1.17 | 1 | 6615 | 74 |
| composition of expired air | 1.64 | 0.8 | 1058 | 2 |
| percentage of carbon dioxide in expired air | 1.1 | 0.4 | 4623 | 7 |
| do oxygen absorbers expire | 1.95 | 0.4 | 2967 | 60 |
| how much oxygen does exhaled air contain | 0.99 | 0.8 | 800 | 82 |
| does medical oxygen expire | 1.62 | 0.1 | 3448 | 89 |
| exhaled air contains 21% oxygen | 0.96 | 0.8 | 7184 | 87 |
| percentage of co2 in expired air | 0.79 | 0.1 | 4930 | 79 |
| how long does oxygen last | 0.71 | 1 | 6498 | 7 |
| what is expired air | 1.68 | 0.5 | 1155 | 31 |
| exhaled air contains about 10% oxygen | 0.73 | 0.6 | 7649 | 36 |
| partial pressure of o2 in expired air | 0.87 | 1 | 351 | 80 |
| how long do unopened oxygen absorbers last | 1.28 | 0.5 | 5679 | 69 |
| oxygen % in air | 0.15 | 0.6 | 6608 | 89 |
| oxygen value in air | 1.69 | 1 | 420 | 23 |
| how long can you stay on oxygen | 0.84 | 0.3 | 1057 | 92 |
| total air volume after maximum expiration | 1.56 | 0.4 | 9344 | 2 |
| does oxygen in tanks expire | 1.8 | 0.9 | 6330 | 85 |
