| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | gas | South Korea | Often used for heating water for bathing | 1 |
| 2 | gas | South Korea | Commonly used for heating water in on-demand water heaters | 1 |
| 3 | helium | South Korea | Used in cooling systems for nuclear reactors and superconducting magnets | 1 |