| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what percent of space is empty | 0.38 | 0.8 | 9663 | 40 |
| what percentage of space is empty | 1.67 | 0.1 | 4736 | 95 |
| what percent of an atom is empty space | 0.41 | 0.3 | 9370 | 40 |
| what percent of the universe is empty space | 0.36 | 0.5 | 3278 | 40 |
| percent of atom that is empty space | 1.6 | 0.9 | 8250 | 35 |
| are atoms 99 percent empty space | 0.41 | 0.6 | 6269 | 74 |
| how much of space is empty | 0.89 | 0.3 | 9460 | 44 |
| what percentage of matter is empty space | 1.73 | 0.2 | 4683 | 4 |
| what percentage of atoms are empty space | 1.19 | 0.3 | 5199 | 50 |
| is empty space really empty | 1.76 | 0.9 | 538 | 51 |
| how empty is space | 0.27 | 0.1 | 609 | 52 |
| what percent of space do we know | 0.79 | 0.5 | 8950 | 24 |
| does empty space exist | 1.43 | 0.6 | 267 | 25 |
| how much energy is in empty space | 0.25 | 0.6 | 5825 | 7 |
| what makes up empty space | 0.19 | 0.8 | 9481 | 90 |
| is air empty space | 1.05 | 0.4 | 8376 | 87 |
| most of the atom is empty space | 1.42 | 0.3 | 9196 | 91 |
| how empty are the dimensions in space | 0.07 | 0.6 | 6150 | 97 |
| is outer space empty | 1 | 0.3 | 7372 | 51 |
| how much empty space in an atom | 1.09 | 0.5 | 8832 | 43 |
| empty space in the universe | 1.75 | 0.5 | 7368 | 46 |
