| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | heavy water | Western countries | Used in nuclear reactors and scientific research for its properties as a moderator or coolant. | 1 |
| 2 | heavy water | western countries | Used in nuclear reactors and scientific research as a neutron moderator and coolant | 1 |
| 3 | heavy water | western countries | Used in nuclear reactors and scientific research for its properties as a neutron moderator. | 1 |