| Share | Phrase |
|---|
| 16.76% | conserve energy [perform operation] |
| 16.54% | conserve power [perform operation] |
| 12.22% | conserve space [perform operation] |
| 11.35% | conserve resource [perform operation] |
| 10.17% | conserve momentum [perform operation] |
| 9.06% | conserve heat [perform operation] |
| 6.37% | conserve fuel [perform operation] |
| 6.11% | conserve charge [perform operation] |
| 4.42% | conserve fluid [perform operation] |
| 4.14% | operate [temporal] conserve |
| 2.80% | conserve time [perform operation] |