 |
| flame propagation: 36 phrases in 15 subjects |
| Astronautics | 2 |
| Cement | 3 |
| Construction | 1 |
| Energy industry | 3 |
| Firefighting and fire-control systems | 7 |
| Gas processing plants | 2 |
| Mathematics | 3 |
| Mechanic engineering | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Public utilities | 4 |
| Technology | 3 |
| Thermal engineering | 2 |
| Weapons of mass destruction | 2 |