| Share | Phrase |
|---|
| 40.30% | endothermic [temperature] reaction |
| 12.85% | endothermic [temperature] gas |
| 12.40% | endothermic [temperature] pyrolysis |
| 8.19% | endothermic [temperature] stream |
| 7.62% | endothermic [temperature] generator |
| 7.44% | endothermic [temperature] fuel |
| 7.17% | endothermic [temperature] catalyst |
| 4.01% | endothermic [temperature] system |