 |
| gases: 1539 phrases in 61 subjects |
| Aerodynamics | 10 |
| Aerohydrodynamics | 2 |
| Agriculture | 1 |
| American usage, not spelling | 8 |
| Ammunition | 4 |
| Astronautics | 58 |
| Aviation | 67 |
| Chemistry | 73 |
| Coal | 5 |
| Communications | 1 |
| Construction | 26 |
| Diplomacy | 7 |
| Drilling | 1 |
| Earth sciences | 4 |
| Ecology | 22 |
| Economy | 10 |
| Electronics | 9 |
| Energy industry | 3 |
| Environment | 42 |
| Finances | 6 |
| Firefighting and fire-control systems | 1 |
| Gas processing plants | 3 |
| General | 127 |
| Geology | 7 |
| Health care | 1 |
| Historical | 1 |
| Industry | 2 |
| Informal | 4 |
| Insurance | 1 |
| International relations | 1 |
| Isolation | 1 |
| Law | 17 |
| Materials science | 1 |
| Mathematics | 1 |
| Mechanic engineering | 4 |
| Medical | 8 |
| Metallurgy | 33 |
| Meteorology | 11 |
| Microelectronics | 49 |
| Military | 215 |
| Mining | 1 |
| Natural sciences | 1 |
| Nautical | 4 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 7 |
| Oil and gas | 569 |
| Oilfields | 1 |
| Physical sciences | 1 |
| Physics | 2 |
| Proverb | 10 |
| Public utilities | 1 |
| Radio | 1 |
| Road construction | 1 |
| Seismology | 1 |
| Statistics | 3 |
| Technology | 80 |
| Telecommunications | 1 |
| Thermal engineering | 1 |
| Transport | 1 |
| Weapons and gunsmithing | 2 |
| Welding | 3 |